Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
hope this helps
As the loudness of the sound input increases, the up and down motion of the membrane covering the can _________
increases
decreases
stay the same
Answer:
decrease!
Explanation:
The fact that loudness of the sound input increases, its starts to move. Each movement pushes the membrane down. Therefore, it decreases. Your welcome !
You have 1 1/2 moles of 1 kg bottles of O2. What is the mass of O2 that you have?
A. 9.033x10^23 kg
B. 9.033x10^23 atoms
C. 1.80x10^27 kg
D. 1.806x10^24 moles
It is not B as I have already tried it :(
Answer:
A: 9.033 × 10^(23) kg
Explanation:
According to avogadro's number, we know that;
1 mole = 6.022 × 10^(23) kg
Thus;
1½(1.5) mole of O2 will produce;
(1.5 × 6.022 × 10^(23))/1 = 9.033 × 10^(23) kg
Looking at the options, the correct one is Option A.
How much heat is needed to raise 125 Grammys of iron from 5.0C to 33C ? The specific heat of iron is 0.450j/g•C
Answer:
ok this might not be right but i think its 1,575??
Explanation:
(125)(28)(0.450)
i think you just multiply the grams, change in temp, then the cp by each other not completely sure tho
Element X is a solid at room temperature.
It needs one electron per atom to gain the electronic structure of a noble gas.
It is the least reactive element in its group.
What is the element X?
1.At
2.Cs
3. F
4. Li
Answer:
Element X is Cs or cesium
How many atoms are in 9.95 moles of iron?
How many molecules are in 0.03 moles of Carbon dioxide?
How many moles are found in 7.20 x 1023 atoms of platinum?
Answer:
59.92 × 10²³ atoms are in 9.95 moles of iron
1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide
1.19 moles are found in 7.20 x 10^23 atoms of platinum
No link or Files plz i need help with this one i been stuck on it for a long time
Answer:
The particles in a solid are tightly packed and locked in place. Although we cannot see it or feel it, the particles are moving or vibrating in place.
Answer:
molecules in a solid are tightly packed together and vibrate about their fixed positions.
Explanation:
there is very little movement between molecules in a solid since there is not much space between the molecules, hence the slight vibrations.
i hope this helps! :D
How to know the state of elements in a reaction
Answer:
each compound or molecule is indicated in subscript next to the compound by an abbreviation in parentheses. For example, a compound in the gas state would be indicated by (g), solid (s), liquid (l), and aqueous (aq).
Explanation:
Why are isotopes with short half-lives not useful for dating very old rocks?
-because not enough of the parent isotope remains to measure accurately
-because not enough of the daughter product has formed to be detectable
-because neither the parent isotope nor the daughter product will be detectable
-because very old rocks would never have contained these isotopes
Answer:
because not enough of the parent isotope remains to measure accurately. because not enough of the daughter product has formed to be detectable.
Explanation:
Hope it helps
Which organ is most directly involved in the excretion of waste products? Please help
Answer:
Explanation:
The liver
Answer:
Kidney
Explanation:
Which step do you use first to calculate the number of grams of FeCl2 produced when starting with 30.3 g of Fe in this reaction?
Answer:
I dont care I want pionts
Calculate the volume of carbon dioxide given off at r.t.p. when 0.9g of glucose ferments.
C6H12O6 (aq) = 2C2H5OH (aq) + 2CO2 (g)
Answer:
2H+(aq) + CaCO3(s) → Ca2+(aq) + H2O(l) +. CO2(g). [ 2]. Award [1] for correct reactants and products. Award [1] if the ... Exercises. 1 Reaction gives off a gas: change in volume could be measured.
2Fe(OH)3 Fe2O3+3H2O how many grams of Fe2O3 are produced if 10.7 grams of Fe (OH)3 react in this way
Answer: 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of} Fe(OH)_3=\frac{10.7g}{106.87g/mol}=0.100mol[/tex]
The chemical equation for the reaction is
[tex]2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O[/tex]
By Stoichiometry of the reaction:
2 moles of [tex]Fe(OH)_3[/tex] produce = 1 mole of [tex]Fe_2O_3[/tex]
So, 0.100 moles of [tex]Fe(OH)_3[/tex] produce= [tex]\frac{1}{2}\times 0.100=0.05mol[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3[/tex] =[tex]moles\times {\text{Molar Mass}}=0.05mol\times 159.69g/mol=7.98g[/tex]
Hence 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
Explain how surface waves work.
Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you were to comb your hair and then hold the comb near your hair, strands of hair would move forward and appear to stick to the comb. How could the interaction between the hair and the comb be described?
They repel each other because they have opposite charges.
They repel each other because they have the same charges.
They attract each other because they have opposite charges.
They attract each other because they have the same charges.
. 2. Which has more atoms: 2.5 mol of calcium carbonate,
CaCO3, or 3.5 mol of calcium hydroxide, Ca(OH)2
Answer:
Calcium hydroxide has more atoms.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rules of three:
If 1 mole of calcium carbonate represents 6.023*10²³ atoms, 2.5 mole of calcium carbonate represents how many atoms?[tex]amount of moles of calcium carbonate=\frac{2.5 moles*6.023*10^{23} atoms}{1 mole}[/tex]
amount of moles of calcium carbonate= 1.50575*10²⁴
If 1 mol of calcium hydroxide represents 6.023*10²³ atoms, 3.5 mol of calcium hydroxide represent how many atoms?[tex]amount of moles of calcium hydroxide=\frac{3.5 moles*6.023*10^{23} atoms}{1 mole}[/tex]
amount of moles of calcium hydroxide= 2.10805*10²⁴
2.10805*10²⁴ is greater is 1.50575*10²⁴, so calcium hydroxide has more atoms.
Organisms that do NOT consume other organisms for food are
known as -
-
Answer:
autotrophs
Explanation:
What are the protons neutrons and electrons of Vanadium-52 +3 charge
HELP
Answer:
Protons: 23
Neutrons: 28
Electrons: 23
I THINK
Explanation:
how would you revise the stimulation so users can evaluate the role of human activity in the pH of the ocean
Answer:
Explanation:
If only one parameter can be changed in the simulation, it would be the global temperature. Human activities cause global warming and the temperature rise has caused the polar ice cap to melt. With more fresh water going into the oceans due to melting ice cap, there is a big impact on the pH.
Answer:
Explanation:
increase CO2 in atmosphere - human activity like driving cars n burning fossil fuel releases air polluntants. CO2, NOx n SO2 are all soluble in water n form acids. of the 3, CO2 is the most common pollutant n has the most effect on the pH in oceans.
Solve,55.1 grams of tin at 90.6°C is dropped into a calorimeter with 75.4 grams of water at 21.0°C.The temperature of both the metal and the water reaches 27.2°C.Solve for the specific heat of tin. pleaseee once u solve it please explain how u solved it.
Answer:
[tex]C_{tin}=0.560\frac{J}{g\°C}[/tex]
Explanation:
Hello there!
In this case, for this calorimetry problem, we can notice that the heat evolved by the hot tin is gained by the cold water as the calorimeter is perfectly isolated, so we can write:
[tex]-Q_{tin}=Q_{water}[/tex]
Thus, by defining the heats in terms of mass, specific heat and temperatures, we get:
[tex]-m_{tin}C_{tin}(T_F-T_{tin})=m_{water}C_{water}(T_F-T_{water})[/tex]
Now, since we are asked for the specific heat of tin, we solve for it as shown below:
[tex]C_{tin}=\frac{m_{water}C_{water}(T_F-T_{water})}{-m_{tin}(T_F-T_{tin})}[/tex]
Thus, when we plug in, we obtain:
[tex]C_{tin}=\frac{75.4g*4.184\frac{J}{g\°C} (27.2\°C-21\°C)}{-55.1g(27.2\°C-90.6\°C)}\\\\C_{tin}=0.560\frac{J}{g\°C}[/tex]
Regards!
What do you think happens to the cells when they do not get the oxygen they need? Why?
Answer:
the cells start to deteriorate
Explanation:
the lack of oxygen to your body and cells will cause them to break down.
The catalytic conversion of ammonia to nitric oxide is the first step in a three-step process, which ultimately results in nitric acid. Balance the equation for the reaction. NH3(g) + O2(g) → NO(g) + H2O(g)
a. 2, 1, 2, 1
b. 3, 2, 3, 3
c. 4, 3, 2, 6
d. 4, 5, 4, 6
The balance equation for the reaction is
4NH₃(g) + 5O₂(g) —> 4NO(g) + 6H₂O(g)The coefficients are 4, 5, 4, 6
Option D. 4, 5, 4, 6 gives the correct answer to the question.
From the question given above, we obtained:
NH₃ + O₂ —> NO + H₂O
The above equation can be balance as illustrated below:
NH₃ + O₂ —> NO + H₂O
There are 2 atoms of H on the right side and 3 atoms on the left side. It can be balance by writing 4 before NH₃ and 6 before H₂O as shown below:
4NH₃ + O₂ —> NO + 6H₂O
There are 4 atoms of N on the left side and 1 atom on the right side. It can be balance by writing 4 before NO as shown below:
4NH₃ + O₂ —> 4NO + 6H₂O
There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by writing 5 before O₂ as shown below:
4NH₃(g) + 5O₂(g) —> 4NO(g) + 6H₂O(g)
Now, the equation is balanced.
The coefficients are 4, 5, 4, 6
Thus, Option D. 4, 5, 4, 6 gives the correct answer to the question.
Learn more: https://brainly.com/question/24898561
Fill in the chart with the following words:
- Potential energy
- kinetic energy
- Chemical energy
- Joules
- Energy
- thermal energy
Answer:
Energy
potential energy kinetic energy
chemical energy thermal energy
joules
Explanation:
chemical energy is a type of potential energy or stored energy. Heat is a kinetic energy and energy is measured in joules.
The first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.
What are various forms of energy ?Potential energy and kinetic energy are two forms of energy that are commonly encountered in physics.
Potential energy is energy that an object possesses due to its position, shape, or state. An object can store potential energy when it is moved away from its equilibrium position, such as when a spring is stretched or a book is lifted to a certain height above the ground.
The amount of potential energy an object has is proportional to its mass, height, and the strength of the force that is acting on it. The average kinetic energy of an object is called its thermal energy.
Therefore, first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.
Find more on potential energy:
https://brainly.com/question/11749818
#SPJ2
Magnesium bromide is an ionic compound with the chemical formula MgBr2, Magnesium is
Answer:
These are Magnesium bromide is MgBr2. “ionic compounds.” When atoms join together, they form either molecules or ionic compounds, depending on whether they are joined by covalent bonds or ionic bonds. ... When atoms join together by ionic bonds, they form “ionic compounds”.
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
Commercially available cold packs are simple in design: a pouch with water on one side, isolated by a barrier from a specific salt on the other side. When the barrier is broken, the salt and water mix and the solution turns cold. Select which of the statements is true about the reaction occurring in cold packs. O The reaction between the salt and water is endothermic. O The reaction between the salt and water is exothermic. O The reaction between the salt and water is neither endothermic nor exothermic. The cold pack releases heat into the environment. #8
Answer:
The reaction between the salt and water is endothermic.
Explanation:
The reaction is endothermic because the reaction absorbs heat and causes the surroundings to become cooler.
What kind of elements are on the left side of the zig-zag line on the periodic table?
Answer:
Metals are found to the left of the zigzag line on the periodic table. B. Nonmetals Nonmetals are found to the right of the zigzag line on the periodic table.
Explanation:
If the average rate of sediment accumulation is 3 cm/1000years, how long would be required for sediments to completely bury seamounts 1.5 km high and convert part of the oceanic ridge into a part of the abyssal plains. (Show your work).
Answer:
500,050000 years
Explanation:
Given that :
Rate of Accumulation = 3cm/ 1000 years
Height of seamounts = 1.5km
Representing height of seamounts in cm;
(1.5 *1000 * 100) = 1500150 cm
Time taken = height / rate
Time taken = (1500150 cm / 3cm) * 1000
Time taken = 500,050000 years
PLZZZ HELP!!! A chemist has synthesized a heavy element in the laboratory and found that it had this electron configuration:
1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p67s25f146d8
What is the name of this element?
a
Bohrium
b
Meitnerium
c
Darmstadtium
d
Seaborgium
e
Hassium
f
Roentgenium
K
Answer:
Darmstadtium! Happy to help! :)
9. A student needs to prepare 100 mL of a 0.50 M ammonium chloride, NH4Cl,
solution. How much solute does he need?
Answer:
2.67g of NH4Cl are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the moles of solute (In this case, NH4Cl), per liter of solution.
To prepare 100mL of a 0.50M are required:
100mL = 0.100L * (0.50 moles / L) = 0.0500 moles NH4Cl
As molar mass of NH4Cl is 53.491g/mol:
0.0500 moles * (53.491g / mol) =
2.67g of NH4Cl are required____ are made up of solutes and solvents
A.Suspension
B.Colloid
C.Solutions
The nucleus of an atom is positively charged
Answer:
It's because of the presence of protons.
Explanation:
A nucleus of an atom has protons and neutrons. We know that a proton has a charge of
+
1
, while a neutron has no charge, or
0
. Therefore, the nucleus of an atom will always have a positive charge.
