Practice Formula Mass (1.7.4) - SOME BASIC CONCEPTS OF CHEMISTRY

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6 sample questions

Question 1.
Calculate the formula mass of potassium chloride (KCl).
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Use the atomic masses from the periodic table.
Question 2.
Which compound would you use molecular mass for?
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Think about whether the compound has distinct molecules.
3Question 3.
What is the formula mass of NaCl?
- 58.5 u
- 74.5 u
- 65.0 u
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Add the atomic weights of sodium and chlorine.
4Question 4.
True or False: Molecular mass applies to ionic compounds.
- True
- False
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Identify the type of compounds first.
Question 5.
Calculate the total formula mass of aluminum sulfate, Al2(SO4)3.
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Remember to calculate the formula mass of the sulfate ion first.
Question 6.
If 10 g of an ionic compound has a formula mass of 80 g/mol, how many moles do you have?
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Use the formula: moles = mass / molar mass.

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