Chem 171 F09 Q7 TernMix Tit Key

# Chem 171 F09 Q7 TernMix Tit Key - Chem 171 Q7 Version A 1(5...

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Chem 171 Q7 Version A (5 pts each) (Show work, unit, sig fig for full credit) 1. Consider a mixture of 10 billion O 2 molecules and 10 billion H 2 molecules. In what way is this mixture similar to a sample containing 10 billion hydrogen peroxide (H 2 O 2 ) molecules? In what way is it different? The mixture is similar to the sample of hydrogen peroxide in that both contain 20 billion oxygen atoms and 20 billion hydrogen atoms since both O 2 and H 2 O 2 contain 2 oxygen atoms per molecule and both H 2 and H 2 O 2 contain 2 hydrogen atoms per molecule. They differ in that they contain different types of molecules: H 2 O 2 molecules in the hydrogen peroxide sample and H 2 and O 2 molecules in the mixture. In addition, the mixture contains 20 billion molecules (10 billion H 2 and 10 billion O 2 ) while the hydrogen peroxide sample contains 10 billion molecules. 2. What is the molarity of a NaOH solution if 35.75 mL of it is required to neutralize 1.070 g KHP given that one mole of KHP reacts with one mole of NaOH? Molar mass of KHP is 204.2 g / mol. What is the normality of the NaOH solution? Moles of KHP = 1.070 g KHP (1 mol / 204.2 g) = 5.240 x 10 -3 mol of KHP Moles of KHP = Moles of NaOH M of NaOH = 5.240 x 10 -3 mol NaOH / 0.03575 L = 0.1466 M NaOH 0.1466 M NaOH = 0.1466 N NaOH Chem 171 Q7 Version B (5 pts each) (Show work, unit, sig fig for full credit) 1. Classify each of the following as a compound, a homogeneous mixture, or a heterogeneous

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Chem 171 F09 Q7 TernMix Tit Key - Chem 171 Q7 Version A 1(5...

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