Answer:
40.06 amu.
Explanation:
From the question given above, the following data were obtained:
Isotope A (K-39)
Mass of A = 39 amu
Abundance of A = 23%
Isotope B (K-40)
Mass of B = 40 amu
Abundance of B = 48%
Isotope C (K-41)
Mass of C = 41 amu
Abundance of C = 100 – (23 + 48)
Abundance of C = 100 – 71
Abundance of C = 29%
Average mass =?
Average mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(39 × 23)/100] + [(40 × 48)/100] + [(41 × 29)/100]
= 8.97 + 19.2 + 11.89
= 40.06 amu
Thus, the average mass of potassium is 40.06 amu
Gold has a molar mass of 197.0 g/mol. What is the concentration of gold in seawater in moles per liter?(please show work)
Answer:
Since you didnt get asked for a spefic weight of gold lets assume it was 5g
Explanation:
5g Au/197 =.02538 mols in 1 liter of sea water is
.02538/1L which gives you a Molarity of .012538 assuming 5g if they ask for a different number just replace 5 with any weight in grams
What are the intermediate chemical equations for this reaction
Reaction 1
Reaction 2
Reaction 3
Answer:
REACTION 2
Explanation:
BEACUSE IT SYA IN THE QUESTION
Answer:
Reaction 1: Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
Reaction 2: MgO(s) + 2HCl(aq) -> MgCl2(aq) + H2O(l)
Reaction 3: H2(g) + ½ O2(g) -> H2O(l)
Explanation:
Is the gravity a black hole strong enough to keep light from escaping True or False
Answer:
The gravitational pull of a black hole is so strong that nothing, not even light, can escape once it gets too close. ... Moving at close to the speed of light, these particles ricochet off the event horizon and get hurled outward along the black hole's axis of rotation
(True)
Question 3 of 7
Which property of a mineral determines whether it can scratch a piece of
calcite?
a. streak
b. luster
c. hardness
d. reactivity
Answer:
C. Hardness
Explanation:
A P E X
State the 2 products formed when a metal reacts with water
Answer:
hydroxide and hydrogen
Explanation:
When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.
Answer: Hydrogen Gas ( H2)
Explanation: When metals react with water they form hydrogen gas which actually react and start to burn and make squeaky pop noises.
An reading of 8 on the pH scale is indicative of?
Answer:
Basic or alkaline
Explanation:
ph 7 is neutral
below 7 is acidic
above 7 is basic or alkaline
Answer:
[tex]\boxed {\boxed {\sf Weak \ base}}[/tex]
Explanation:
The pH scale which classifies a solution's acidity or basicity.
A pH below 7 is acidic. This means it has more hydrogen ions. A pH equal to 7 is neutral. This has equal hydrogen and hydroxide ions.A pH above 7 is basic. This has more hydroxide ions.We are given a reading of 8. This is above 7, but not much greater. Therefore, it could be classified as a weak base.
20 points to whoever can answer these 3 questions correctly
Pt. 2
Answer:
1. AlBr3
2. 2
3. sulfuric acid
Explanation:
the atoms in the same period on the periodic table all have what ?
A - The same abbreviation
B - The same number of electron shells
C - the same number of electrons
D - the same number of electrons on the outer energy level
Answer:
B.
Explanation:
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
Help pls thnk you!!!!!!!!!!!!!!!!!
what type of chemical reaction is this equation?
Answer:
Explanation:
It resembles a simple composition. Your instructor may not accept that answer. What is happening is the Fe is giving up 2 electrons so that it may embrace the C5H5.
That's usually what happens in a simple composition.
What makes me wonder is the C5H5. It has no charge and yet the Fe is shown as giving up 2 electrons. I'm guessing that either a halogen is introduced or something is to the left of C5H5 on the left side of the equation.
Anyway it is a composition of some kind.
What causes rocks to change and form into new types of rocks?
Answer:
The three main rock types are igneous, metamorphic and sedimentary. The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
Heellllp plzz
thanks
Answer:
Tap test
Explanation:
Answer:
the rest dont sound as reasonable to me so i would say C
Explanation:
Please please help
1. If you have 400 grams of water, how many moles do you have?
2. If you have 300 grams of carbon, how many moles do you have?
Answer: 6 moles of Carbon.
Explanation: One mole of Carbon is equal to 12 grams of Carbon, so you would divide 72 by 12 and the answer would be 6.
In order to become a chemically stable ion, a neutral atom of sodium will _______.
A. lose one electron
B. lose two electrons
C. gain two electrons
D. gain one electron
Answer:
D. gain one electron
Explanation:
In order to become a chemically stable ion, a neutral atom of sodium will gain one electron. Therefore, the correct option is option D.
What is chemical stability?Chemical stability in chemistry refers to a chemical system's thermodynamic stability. When a system reaches its lowest energy state or in thermodynamic equilibrium with its surroundings, thermodynamic stability occurs.
It could be a spontaneous process when the total number of atoms or molecules in a given shape is conserved despite the fact that individual particles or atoms change forms. In order to become a chemically stable ion, a neutral atom of sodium will gain one electron.
Therefore, the correct option is option D.
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HELLPPPPPP PLEASEEEE!!!!!
What is the slope of the line?
What two ways you can increase the frictional force between two objects?
( 8th grade )
Frictional force between two objects can be increased by:
i) making the surfaces rough
ii) increasing the mass of the object that ks moving.
Hope it helps you.
This formula equation is unbalanced.
BaCl2(aq) + Na2CO3(aq) Right arrow. BaCO3(s) + NaCl(aq)
Which coefficient should be placed in front of NaCl to balance this equation?
1
2
3
4
Answer:
2
Explanation:
A chemical equation comprises of substances called reactants and other substances called products. The reactants combine together to form the products. However, according to the law of conservation of matter, the number of atoms of each element in the reactant side must be equal to that on the product side. This is called a BALANCED EQUATION.
However, to balance an equation, COEFFICIENTS are used to ensure the number of atoms of each element equate on both sides. In this question where the following unbalanced equation was given:
BaCl2(aq) + Na2CO3(aq) → BaCO3(s) + NaCl(aq)
It can be observed that the number of atoms of sodium (Na) does not equate on both sides. Hence, we use a coefficient of 2 on NaCl to equate them. The balanced equation reads:
BaCl2(aq) + Na2CO3(aq) → BaCO3(s) + 2NaCl(aq)
Answer:
2
Explanation:
What are gravitational forces?
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects
The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe!
Gravitational force is the force that attracts to objects with mass. ... This forces tries to pull masses together, that is why attractive in nature. For example: When ball is thrown upwards it always come downwards after a certain height because the ball is pulled or attracted by the Earth's gravitation la force.
¯\_(ツ)_/¯
Answer:
Good Question!!! No one has found the answer to that question.
Explanation:
If I have 5.275 moles of gas at a temperature of 575 K and a pressure of 7.75 atmospheres, what is the volume of the gas?
Answer:
hi
Explanation:
1. Carbon is important because:
A. it is part of the carbon cycle
B. it makes up part of all life forms on Earth
C. it is related to oxygen
D. it is found in excess in the ocean
Answer:
B
Explanation:
All organic material has carbon.
the answer is b. :)))))))))))))
In a rate law the rate constant k, depends on which condition?
Answer:
Temperature is the awnser
2C3H6O + 8O2 --> 6CO2 + 6H2O
The combustion reaction for propanol is given above. How many moles of water are produced if 0.15 moles of propanol (C3H6O) reacts with an excess amount oxygen gas?
Please try to show work if possible!
Answer: 0.45 moles of [tex]H_2O[/tex] will be produced from 0.15 moles of propanol.
Explanation:
The balanced chemical reaction is:
[tex]2C_3H_6O+8O_2\rightarrow 6CO_2+6H_2O[/tex]
[tex]C_3H_6O[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
According to stoichiometry :
2 moles of [tex]C_3H_6O[/tex]produces = 6 moles of [tex]H_2O[/tex]
Thus 0.15 moles of [tex]V[/tex] will produce=[tex]\frac{6}{2}\times 0.15=0.45moles[/tex] of [tex]H_2O[/tex]
Thus 0.45 moles of [tex]H_2O[/tex] will be produced from 0.15 moles of propanol.
A thick, oily liquid found deep in the earth that is refined and used as a source for gasoline is called _____________?
Petroleum
Reserve
Lumber
Coal
It would be A, Petroleum.
Hope this helped!
-William
explain the trend in boiling parts of the halogen
Answer:
The boiling point of the halogens increases as you go down the group. The halogens exist as diatomic molecules, with both atoms sharing an electron to completely fill the outer shell. The increase in boiling (and melting point) can be attributed to the increase in intermolecular forces (van der Waals).tion:
which question is the student most likely trying to answer?
Answer:
A
Explanation:
El silicio está formado por un 93% del isótopo de masa atómica 28 uma un 4% del isótopo de masa atómica 29 uma y el resto por el isótopo de masa atómica 30 uma
Answer:
hhhhhhhhhhhhhhhhhhhhhhhhhhhh
Explanation:
Balance the following equation:
Sg + F2 --> SF
Answer:
S+ F2 ⇒ SF
S=1
F =2
So S +F2 ......... 2SF
2S + F2 ..........2SF this is a balance equation
S=2 F=2 in left side s=2 F = 2 in rightside
Explanation:⇆
⇒
ok so can someone help me with my guy problems
Answer:
ofc! whats ur question my guy
Explanation:
Answer:
sure
Explanation:
PLEASE HELP ASAP
Aluminum oxide (Al2O3) and iron (Fe) react according to the following
balanced equation:
4Al2O3 + 9Fe + 3Fe304 + 8A|
If there are 10.2 grams of Al2O3 and 11.2 grams of Fe, which statement
identifies the limiting reagent in this reaction and best supports that claim?
Answer:
Fe is the limiting reagent
Explanation:
In a chemical reaction, the limiting reactant, also known as the limiting reagent. Therefore, the correct option is option C.
What is limiting reagent?In a chemical reaction, the limiting reactant, also known as the limiting reagent, controls how much product is produced. Calculating the percentage value of a reaction is achievable if the limiting reactant has been identified.
Because elements and compounds in an equilibrium chemical equation react in accordance with their mole ratios, there must be a limiting reactant. Therefore, when one of the reactants was present in a larger amount than the other and the mole ratio inside the balanced equation specifies that it takes 1 mole from each reactant to generate a product, the reactant existing in the lesser amount would be the limiting reactant.
4Al[tex]_2[/tex]O[tex]_3[/tex] + 9Fe [tex]\rightarrow[/tex] 3Fe[tex]_3[/tex]O[tex]_4[/tex] + 8A|
moles of Al[tex]_2[/tex]O[tex]_3[/tex] = 10.2 /101.96
=0.10moles
moles of Fe = 11.2/55.8
=0.20
Fe is the limiting reagent
Therefore, the correct option is option C.
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