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13. 18.2 g Co 1 mol Ca = .456 mol Ca .456 = 1 Ca<br />
40.1 g Ca .456<br />
32.37 g Cl 1 mol Cl = .912 mol Cl .912 = 2 Cl<br />
35.5 g Cl .456<br />
49.3 g H 2 O 1 mol H 2 O = 2.74 mol H 2 O 2.74 = 6.01 H 2 O<br />
18.0 g H 2 O .456<br />
CaCl 2 * 6 H 2 O<br />
14. Fe(NO 3 ) 2 contains 1 mol Fe atoms 15. 3 HC 2 H 3 O 2 contains 3 mol hydrogen (3 H)<br />
2 mol N atoms 9 mol hydrogen (3 H 3 )<br />
6 mol O atoms = 12 mol hydrogen<br />
= 9 mol atoms
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