If 4 g of nitrogen gas contain y molecules, how many molecules are present in 64 g of oxygen gas?
given that the relative atomic masses: N = 14.0 , O = 16.0
A. Y
B. 7Y
C. 14Y
D. 21Y
HOW TO DO?????
f.4 chem
2007-02-05 2:53 am
回答 (1)
2007-02-05 3:09 am
✔ 最佳答案
For 4g of nitrogen,moles of molecules = 4/(14 * 2) = 1/7 mol
So, y = 1/7
For 64g of oxygen,
moles of molecules = 64/(16 * 2) = 2 mol = 14 * 1/7 = 14Y
The answer is C
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