An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 115.00 u and 117.00 u, with natural abundances of 25% and 75%, respectively. Calculate its average atomic mass. Report your answer to 2 decimal places.
[tex](115.00)(0.25)+(117.00)(0.75)=\boxed{116.50 \text{ u}}[/tex]
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Answer:
The energy will be added
Explanation:
4.0 mol Na2S reacts with 5.0 mol
CuSO4 according to the equation below:
Na₂S + CuSO4 → Na₂SO4 + CuS
How many moles of Na2SO4 form from 5.0 moles of CuSO4?
[?] mol Na₂SO4
Round your answer to the tenths place.
The number of moles of [tex]Na_2SO_4[/tex] form from 5.0 moles [tex]Na_2S[/tex] is 5 moles.
What is a limiting reactant?Limiting reactants are those reactants that are completely used up in a chemical reaction.
4.0 mol [tex]Na_2S[/tex] will be completely used since the combining ratio is 1 : 1 : 1.
[tex]Na_2S + CuSO_4[/tex] ->[tex]Na_2SO_4 + CuS[/tex]
From the chemical equation above, 5.0 moles [tex]Na_2S[/tex] will yield 5 moles of [tex]Na_2SO_4[/tex].
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Which of the following is NOT an example of combustion occurring?
A. A car engine
B. A rocket lifting off
C. Battery acid burning the floor
D. A bonfire
Answer:
C. Battery acid burning the floor
Explanation:
C. Battery acid burning the floor
in combustion fire is created
Battery acid burning the floor is NOT an example of combustion occurring.
The answer is option C.
What is combustion?Combustion is a chemical process or a reaction between the gas (Hydrocarbon) and Oxygen. while gasoline and oxygen react it releases warmth and light energy. heat and light energy then result in the flame. So, the system for Combustion reaction is Hydrobcarbon + Oxygen = warmness electricity.
Combustion in daily existence examples is: Burning of wooden or Coal for the family functions. Burning of Petrol or Diesel for using vehicles like vehicles. Combustion of herbal gas or LPG.
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How many calories are absorbed
when water absorbs 6.55 kJ of
energy?
[?] cal
The number of calories which are absorbed when water absorbs 6.55 KJ of energy is 1565.49 calories
How do I determine the number of calories absorbed?To know the number of calories which are absorbed when water absorbs 6.55 KJ of energy, we shall begin by converting 6.55 KJ to joules (J). Details below:
Energy (in KJ) = 6.55 KJEnergy (in J) =?1 KJ = 1000 J
Therefore,
6.55 KJ = (6.55 KJ × 1000 J) / 1 KJ
6.55 KJ = 6550 J
Finally, we shall convert 6550 J to calories. This is illustrated below:
Energy (in J) = 6550 JEnergy (in calories) =?4.184 J = 1 calorie
Therefore,
6550 J = (6550 J × 1 calorie) / 4.184 J
6550 J = 1565.49 calories
Thus, from the above calculations, we can conclude that the number of calories absorbed is 1565.49 calories
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C3 H8=H2O2+CO2 chemically balanced in chemistry
[tex]C_{3} H_{8} +5O_{2}[/tex]→[tex]3CO_{2} +4H_{2} O[/tex]
The given reaction is of complete combustion of propane in presence of oxygen.
Molecular formula of propane gas= [tex]C_{3} H_{8}[/tex]
Combustion is a oxidation of a organic molecule into carbon dioxide and water .
Here oxygen serves as a oxidizing agent and oxidizes propane into carbo dioxide and water molecule.
The unbalanced reaction can be given as:
[tex]C_{3} H_{8} +O_{2}[/tex] →[tex]CO_{2} +H_{2} O[/tex]
Here, 3 carbons are there in propane.
so, 3 carbon dioxide molecules are formed to balance the reaction.
So, when 3 carbon dioxides are formed 3 oxygen molecules also needed.
Due to presence of 8 hydrogen in propane 4 water molecules forms , which contains 4 O means 2 oxygen molecules .
There for, total 5 molecules of oxygen are needed to balance the equation.
The final balanced equation can be given as..
[tex]C_{3} H_{8} +5O_{2}[/tex]→[tex]3CO_{2} +4H_{2} O[/tex]
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What is the volume of a
0.40 M Nal solution that contains
0.20 moles Nal in it?
Answer:
500ml or 0.5l
Explanation:
The concentration is 0.40 M so there are 0.40 moles in 1 l of the solution.
0.40 moles -> 1 l
but we have to go to 0.20 moles, 0.40/2 = 0.20 moles but we have to divide the volume also by 2 that makes 0.5 liters.
Answer: 0.5
Explanation:
The concentration is 0.40 M so there are 0.40 moles in 1 l of the solution.
0.40 moles -> 1 l
but we have to go to 0.20 moles, 0.40/2 = 0.20 moles but we have to divide the volume also by 2 that makes 0.5 liters.
Which particles that make up an atom are involved in nuclear reactions?.
lithium
potassium.
calcium
sodium
magnesium
aluminum.
zinc
iron
nickel
lead
hydrogen
copper
mercury
silver
gold
An unknown metal displaces aluminum (Al) from solution but does not displace sodium (Na). Using the activity series, determine the unknown
metal.
OA. Calcium (ca)
OB. zinc (Zn)
OC. manganese (Mn)
OD. magnesium (Mg)
increasing activity
calcium (Ca)
Answer:
The unknown metal could be calcium or magnesium.
Explanation:
Displacement of a metal from its chemical reaction is shown by the reaction known as single displacement reaction. The reactivity of metal is determined by the reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the reactivity series.
Metal B is more reactive than metal A.
The metal which easily displaced aluminium will lie above in the series but that same element cannot displace sodium, so it will lie below in the series.
Hence, from the series, we conclude that the unknown metal could be calcium or magnesium.
According to the phase diagram for H₂O, what happens to the phases of
water at 0°C as the pressure is increased from 0 atm to 10 atm?
Answer:
"A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.
Explanation:
The question asks what happens at 0°C, as pressure is increased from 0atm to 10atm.
According to the question, the temperature is held constant. The pressure changes. In the phase diagram, we find the temperature 0°C on the horizontal axis, and all points where the temperature are 0°C are along that vertical line.
Since the pressure starts at 0atm and increases to 10atm, we start at the bottom, and move upward along that line, to see what phases of matter the substance changes to.
At the bottom, it is initially in a "gas" phase. As it moves up, it transitions to a "solid" phase. Later, as it continues moving up, it changes again into a "liquid" phase.
Thus, the answer would be "A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.
If u can write like a sentence or two would be amazing:
Outline the differences between respiration and combustion.
Respiration is the process of oxidation of food materials like glucose, Amino acids, fatty acids to water and carbon dioxide. Respiration does not require any external heat to carry on the process. Combustion is only done by applying external heat to the sugar molecule to burn.
For the reaction C+ 2H2 → CH4, how many grams of hydrogen are required to produce 5 moles of
methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element
Hydrogen
Carbon
Molar Mass
1
12
10 mol of H₂ required to produce 5 moles of methane (CH₄)
What is Mole ratio ?Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.
The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
Given reaction ;
C + 2H₂ -------> CH₄
from reaction 2 mol 1 mol
from the question x mol 5 mol (given)
Now,
x = 2 x 15 / 1 = 10 mol
= 10 mol of H₂.
Hence, 10 mol of H₂ required to produce 5 moles of methane (CH₄)
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8.0 mol AgNO3 reacts with 5.0 mol Zn in
a single replacement reaction.
2AgNO3 + Zn → 2Ag + Zn(NO3)2
How many moles of Ag form from 8.0
mol AgNO3?
[?] mol Ag
Round your answer to the tenths place.
Taking into account the reaction stoichiometry, 8 moles of Ag can be produced from 8 moles of AgNO₃ and 5 moles of Zn.
Reaction stoichiometryIn first place, the balanced reaction is:
2 AgNO₃ + Zn → 2 Ag + Zn(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
AgNO₃: 2 moles Zn: 1 mole Ag: 2 moles Zn(NO₃)₂: 1 moleLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of Zn reacts with 2 moles of AgNO₃, 5 moles of Zn reacts with how many moles of AgNO₃?
[tex]amount of moles of AgNO_{3}= \frac{5 moles of Znx2 moles of AgNO_{3}}{1 mole of Zn}[/tex]
amount of moles of AgNO₃= 10 moles
But 10 moles of AgNO₃ are not available, 8 moles are available. Since you have less moles than you need to react with 5 moles of Zn, AgNO₃ will be the limiting reagent.
Moles of Ag formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of AgNO₃ form 2 moles of Ag, 8 moles of AgNO₃ form how many moles of Ag?
[tex]amount of moles of Ag=\frac{8 moles of AgNO_{3}x2 moles of Ag }{2 moles of AgNO_{3}}[/tex]
amount of moles of Ag= 8 moles
Then, 8 moles of Ag can be produced from 8 moles of AgNO₃ and 5 moles of Zn.
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Please help asap! giving brainliest to correct answer!!
which pair of compounds has the same empirical formula? (5 points)
select one:
a. c3h8 and c3h
b. c2h2 and c2h
c. c4h10 and c6h
d. c4h10 and c2h5
Answer:
D. C₄H₁₀ and C₂H₅
What is a empirical formula?
A chemical formula indicating the elements of a compound and their relative proportions, as (CH₂O)n.
Since an empirical formula indicates the ratio (proportions) of the elements in the compound, it can be used, along with the molar weight of the compound, to determine the molecular formula.
The empirical formula provides the smallest whole-number ratio among elements or compounds within a molecular compound. A compound is a chemical formed from atoms of different chemical elements.
Hence, Option D is correct.
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A group of students working in a chemistry lab are planning a procedure to
neutralize hydrochloric acid (HCI, strong acid). How should they BEST accomplish
this?
use a strong base to neutralize, like NaOH, KOH, etc
What is the change in
temperature when water goes
from 65.0 °C to 25.0 °C?
AT = [?] °C
Answer:
-40.0 °C
Explanation:
Change in temperature can be written as [tex]\displaystyle{\Delta T = T_2-T_1}[/tex]. The variables are defined below here:
[tex]\displaystyle{\Delta T}[/tex] means change in temperature.
[tex]\displaystyle{T_2}[/tex] means the final temperature value.
[tex]\displaystyle{T_1}[/tex] means the initial temperature value.
From the question, we know the temperature changes from 65.0 °C to 25.0 °C. Therefore, our initial temperature is 65.0 °C and final temperature is 25.0 °C.
Hence:
[tex]\displaystyle{\Delta T=25.0-65.0}\\\\\displaystyle{\Delta T = -40.0}[/tex]
Therefore, the change in temperature is -40.0 °C.
I need the answer asap
Answer:
Explanation:
i ned help
Oxygan is an example of a(n)
Oxygen is an example of a diatomic element.
You are trying to determine how
many moles of lithium nitrate are in
256 mL of a 0.855 M solution.
How many liters is 256 mL?
Answer:
0,218 moles
Explanation:
I will first explain how many liters is 256ml, that is 0,256 l.
because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)
To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.
Answer: 0.256
Explanation:
What mass of H2 forms when
35.25 g Al reacts with excess
hydrochloric acid?
2AI + 6HCI →→2AICI 3 + 3H₂
Based on the mass ratio, the mass of H₂ produced is 3.51 g of H₂
What is the mass ratio of a reaction?The mass ratio of a reaction is the ratio of the masses of the reactants as well as as products in a balanced equation of a reaction.
The equation of the reaction is given below;
2 AI + 6 HCI → 2 AICI₃ + 3 H₂
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
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Answer:
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
Explanation:
in this experiment, calcium hydroxide was partially dissolved in pure water. which of the following choices correctly expresses the relationship between [ca2 ] and [oh−] in this mixture?
The relationship between [tex][Ca2^{2+}][/tex] and [tex][OH^{-}][/tex] in this mixture is that there are 2 mole of hydroxide ions for every 1 mole of calcium ions.
What is solubility of a solute?The solubility of a solute is the amount of solute that can dissolve in a given volume of solvent at a particular temperature.
Calcium hydroxide is partially soluble in water. The dissolution of calcium hydroxide in water produces calcium ions and hydroxide ions.
The equation of the reaction is given below:
[tex]Ca(OH)_{2} \leftrightharpoons Ca^{2+} + 2\:OH^{-}[/tex]
Based on the equation of reaction, there are 2 mole of hydroxide ions for every mole of calcium ions.
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What is the theoretical yield of NaBr
when 2.36 moles of FeBr3 reacts?
2FeBr3 + 3Na2S → Fе₂S3 + 6NaBr
[?] mol NaBr
Round your answer to the hundredths place
The theoretical yield of NaBr given that 2.36 moles of FeBr₃ reacts is 7.08 moles
Balanced equation2FeBr₃ + 3Na₂S → Fе₂S₃ + 6NaBr
From the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
How to determine the theoretical yield of NaBrFrom the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
Therefore,
2.36 moles FeBr₃ will react to produce = (2.36 × 6) / 2 = 7.08 moles of NaBr
Therefore,
Thus, the theoretical yield of NaBr is 7.08 moles
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Answer:
7.08
Explanation:
What is the si unit if sound
Explanation:
The SI Unit of sound is decibel.
or we can say that
The SI Unit of sound is watt per square metre (i.e.w/m2).
When water vapor cools, it condenses.
Which number represents this process on the hydrologic cycle
diagram?
O 1
02
O 3
04
Number 2 represents this process on the hydrologic cycle diagram. Therefore, the correct option is option B.
What is hydrologic cycle?One of the most significant natural processes is the hydrologic cycle, which we may often take for granted. This process causes the water in the entire earth to change forms, locations, or accessibility.
Water transitions between three distinct forms during this cycle, to put it simply. It can be found in many states of liquid, gas, or solid, including ice, steam, and water. Water will frequently transition between these three states throughout the cycle: freezing into ice, melting into water, evaporating becoming water vapor, but finally condensing back into water. Number 2 represents this process on the hydrologic cycle diagram.
Therefore, the correct option is option B.
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60 ml of a 1.0 m solution of h2so4 is mixed with distilled water to make 1 l of solution. what is the molarity
Answer:
0.057 M
Explanation:
To find the new molarity, you need to (1) find the moles (via the molarity equation using the old molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the combined volume and old moles).
(Step 1)
60 mL / 1,000 = 0.06 L
Molarity (M) = moles / volume (L)
1.0 M = moles / 0.06 L
(1.0 M) x (0.06 L) = moles
0.06 = moles
(Step 2)
0.06 L + 1 L = 1.06 L
Molarity (M) = moles / volume (L)
Molarity = 0.06 moles / 1.06 L
Molarity = 0.057 M
Explain the large variation in boiling temperatures, given the small range in Me values.
Answer:
32.0 is the answer which is divide able to 65 or -85
What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl
Use the References to access important values if needed for this question. The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers. For each of the orbitals below list a set of possible quantum numbers. Give only one value for each Orbital ... n ... ... l ... ... ml ... ... ms ... 1s fill in the blank 4 There are a total of values possible for ml 3s
The quantum numbers are used to describe the position of an electron in atom.
What are quantum numbers?The quantum numbers are used to describe the position of an electron in atom. I have attached a picture that shows the complete question.
For the 1s orbital;
n =1
l = 0
ml = 0
ms = ±1/2
For the 2s orbital;
n = 2
l = 1
ml = -1, 0, 1
ms = ±1/2
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How many milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda? Show your work.
225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
How to calculate volume?The volume of a substance can be calculated using the following formula:
molarity = no of moles ÷ volume
no of moles of baking soda (NaHCO3) = mass ÷ molar mass
Molar mass of baking soda = 84.007g/mol
no of moles = 15g ÷ 84.007g/mol = 0.18mol
0.8 = 0.18/volume
volume = 0.23L equivalent to 225mL
Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
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225 millilitres of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
Define molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
[tex]Molality = \frac{Moles \;solute}{Volume of solution in litre}[/tex]
[tex]Moles of baking soda (NaHCO_3) =\frac{mass}{molar \;mass}[/tex]
Molar mass of baking soda = 84.007g/mol
[tex]Moles of baking soda (NaHCO_3) =\frac{15g}{84.007g/mol}[/tex]
[tex]Moles of baking soda (NaHCO_3) = 0.18mol[/tex]
Now, calculating volume with the molarity formula:
Molality = [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
0.8 = [tex]\frac{0.18 }{Volume \;of \;solution \;in \;litre}[/tex]
Volume = 0.23L equivalent to 225mL
Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
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