Moles --> Grams and Grams --> Moles problems?

Question

I am studying how to figure out how many moles are in a certain mass of a substance and how many grams in a certain amount of moles. Could you post some practice problems that I could work on?

PLEASE INCLUDE THE ANSWERS IN YOUR POSTS!

Answer 1

There's a couple of practice questions at the end..

...A 'Mole' of a compound is defined as "The number of grams (or other weight (mass) unit of the compound that is equal to its Molecular weight (Mass)".
...A mole may be called 'Gram-mole'; 'Lb-mole'; 'Kilo-mole' ..etc.
...e.g. The Mol. Wt. of water (H2O) = 2 + 16 = 18.
...18 grams of water is called 1 g-mole or 18 lbs of water is called 1 lb-mole.

...From this we can calculate the number of 'Kilo-moles'in 900 kg of water.
...Divide the number of Kg by the mol.wt.
...= 900 ÷ 18 = 50 kilo-moles of water.
...A mole is represented by the formula of the compound. e.g. water, H2O = 1 mole of water.
...To show more than 1 mole, a number is placed in front of the formula. e.g. 3H2O = 3 moles of water.
...Example: Take 20 lb of NaCl; Mol.wt of NaCl = 23 + 35 = 58.
...Number of moles of NaCl = 20 lb ÷ 58 lb-mole = 0.345 lb-mole.

Try these examples: -
... How many Kilo-moles in 12 kg of CO2 ?
...Ans: CO2 = Mol.wt. = ?
.........= ? 0.273 kg-mole.
...How many Gram-moles in 24g of H2SO4 ?
...Ans: H2SO4 = Mol.wt. = ?
........... ? = 0.245 g-mole.
...Now:Make up some for yourself.

Answer 2

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Answer 3

1. What is the mass of 0.25 moles of CO2?

2. How many moles of methane are there in 320g of CH4?

3. What is the mass of 5 moles of ammonium sulphate, (NH4)2SO4?

4, How many moles of sodium chloride are there in 175.5g of NaCl?

Answer 4

mole = mass / atomic mass ....(if it truly is in reality an atom) mole = mass / molecular mass ......(even if it truly is a compound) mole of Mg = 2.50 / 24 = 0.104 mol From the balanced chemical equation, a million mol of Mg will react with 2 moles of HCl. therefore, 0.104 mol of Mg provide you with 0.104/a million x 2 = 0.208 mol of HCl Now, utilized the needed formula for mole. mole = mass / molecular mass mass of HCl fed on = 0.208 x (a million+35.5) = 7.fifty 9 g ....(3 significant figures for the perfect answer) i imagine that is the way you and your instructor can understand. Edit: I misread the question. Mole is already given. besides, the different answer could hide it up for me.