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Ascorbic acid has a molar mass of 176.14 g/mol. What is the molecular formula of ascorbic acid?
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3. Chemical Reactions
Molecular Formula
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How many nitrogen atoms are present in one molecule of N2H4?
A
2
B
1
C
4
D
3
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Identify the chemical formula of the molecule given, which is N2H4. This formula tells us the number of each type of atom in one molecule.
Look at the subscript number immediately following the element symbol 'N' in the formula N2H4. The subscript indicates how many nitrogen atoms are present.
In N2H4, the subscript '2' after 'N' means there are 2 nitrogen atoms in one molecule.
Confirm that the subscript applies only to the element it follows, so the '4' applies to hydrogen atoms, not nitrogen.
Conclude that the number of nitrogen atoms in one molecule of N2H4 is 2.
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