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erica [24]
3 years ago
10

If 0.250 g of a gas sample represents 1.05x10–2 mol, what is the molar mass of the gas?

Chemistry
1 answer:
prohojiy [21]3 years ago
7 0
<span>23.8 g/mol Since the definition of molar mass is mass per mole, just divide the mass of the sample by the number of moles you have. So 0.250 g / 1.05x10^-2 mol = 23.8095 g/mol Since our input data only has 3 significant figures, you need to round the result to 3 significant figures. 23.8095 g/mol rounds to 23.8 g/mol</span>
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In the simple act of lighting a match, chemical energy stored in the match head is transformed into heat and light. What is true
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5 0
2 years ago
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A penny has a mass of 2.50g and the Moon has a mass of ×7.351022kg, How many moles of pennies have a mass equal to the mass of t
baherus [9]
Answer: 122 moles

Procedure:

1) Convert all the units to the same unit

2) mass of a penny = 2.50 g

3) mass of the Moon = 7.35 * 10^22 kg (I had to arrage your numbers because it was wrong).

=> 7.35 * 10^22 kg * 1000 g / kg = 7.35 * 10^ 25 g.

4) find how many times the mass of a penny is contained in the mass of the Moon.

You have to divide the mass of the Moon by the mass of a penny

7.35 * 10^ 25 g / 2.50 g = 2.94 * 10^25 pennies

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5) Convert the number of pennies into mole unit. That is using Avogadros's number: 6.022 * 10^ 23

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Answer: 122 mol
8 0
2 years ago
How many moles of Na2SO4 can be made with 7.28 mol of H2SO4?
Slav-nsk [51]

Answer:

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Explanation:

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A molar ratio is the proportions of reactants and products using the balanced equation. When writing a mole ratio, the given information must cross out with the right thing.

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2 years ago
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Please help with 1 chemistry question thank you!
ale4655 [162]
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Choice 1 is incorrect

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Choice 2 is incorrect

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By process of elimination, you can infer choice 4 is correct.

Actually, choice 4 is the only choice that displays the correct name and formula.

Have an awesome day! :)
7 0
3 years ago
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