How many molecules are present in 3HNO4?

1) 14
2) 18
3) 3
4) 4

2

Explanation:

If you take H and N, that is two molecules right off the bat.  If you take O4, that makes 6.  Take the total of all 6, and multiply it by 3, with equals 18.  

3HNO4 = 18

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the correct answer would be b) volume versus temperature, because they are also directly proportional.