CHEM 141 Homework 09 – due Sept 28 in class 1.What is the formula mass of a compound? Why is it useful? 2.Calculate the formula mass of the following substances: (a) Li2CO3(b) CS2(c) Ca(NO3)23.Calculate the molar mass of a compound if 0.372 moles of it has a mass of 152 g. 4.Calculate the number of moles of each sample: (a) 55.98 g CF2Cl2(b) 23.6 kg Fe(NO3)2(c) 0.1187 g C8H18 5.A crystal of table salt has mass of 0.12 mg. How many NaCl formula units does it contain?
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