Perform the following calculations. Please show all work to ensure

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Name: ___________________________________ Period: ______ Date: _________________
CP Chemistry – Unit 7 advanced review
Perform the following calculations. Please show all work to ensure that you receive maximum
credit and make sure that you use labels, sig figs, and circle your answer!
1. What is the molar mass of ammonium nitrate?
2. Calculate the number of moles of Na2CO3 in a 28.35g sample (you will need the molar mass
of sodium carbonate, see the minimal review):
3.
Calculate the mass (in g) of 2.47x1023 atoms of Lithium:
4. How many molecules are in 18.0 grams of nitrogen gas?
5. Calculate the percent composition of hydrogen in nitric acid (you will need the molar mass).
Version advanced review
6. A compound with the empirical formula CH2O, was found to have a molar mass of 149.8g.
What is the molecular formula of the compound?
7. Find he empirical formula:
Mass percent info:
40.27% C, 6.30% H, and 53.33% O
Version advanced review
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