Gram/mole Conversions Worksheet With Answers Page 2
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1
210. How many moles of N H are there in 25.8 g?
mole
25.8 g
= 0.80 moles
32.06 g
11. Suppose you need 5.19 moles of Ca(OH) . How many grams would you need to weigh out?
molar mass = 40.08 g/mol + 2(16.00 g/mol) + 2(1.01 g/mol) = 74.10 g/mol
74.10 g
5.19 moles
= 384 g
mole
12. Ammonia and oxygen react to form nitrogen and water:
4N H + 3O
2N + 6H O
How many moles of O are needed to react with 8.0 moles NH ?
3 moles O
8.0 moles N H
= 6 moles O
4 moles N H
Challenge Questions:
How many grams of N can be produced when 6.50 grams of O reacts?
1 mole O
2 moles N
28.02 g N
6.50 g O
= 3.79 g N
32.0 g O
3 moles O
1 mole N
How many grams of water can be formed from the reaction of 34 g of NH ?
1 mole
6 moles H O
18.02 g H O
34 g N H
= 54 g H O
17.04 g
4 moles N H
1 mole H O
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