Portage learning chem 103 module 2 exam questions and solutions

CHEM 103 qa




MODULE 2 EXAM 2022 qa qa qa




Question 1 q a




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Show the calculation of the molecular weight for the following compounds,
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reporting your answer to 2 places after the decimal.
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1. Al2(CO3)3


2. C8H6NO4Cl


1. 2Al+3C+9O=233.99
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, 2. 8C+6H + N +4O +Cl= 215.59
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Question 2 q a




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Show the calculation of the number of moles in the given amount of the following
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substances. Report your answerto 3 significant figures.
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1. 13.0gramsof(NH4)2CO3
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2. 16.0gramsofC8H6NO4Br
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1. Moles=grams/molecularweight=13.0/96.09=0.135mole
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2. Moles=grams/molecularweight=16.0/260.04=0.0615 mole
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Question 3 q a




qa Clickthis linktoaccess thePeriodic Table. Thismay be helpful throughout the
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qa exam.


Show the calculation of the number of grams in the given amount of the following
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substances. Report your answer to 1 place after the decimal.
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1. 1.20molesof(NH4)2CO3
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2. 1.04molesofC8H6NO4Br
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1. Grams=Molesxmolecularweight=1.20x96.09=115.3grams
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2. Grams=Molesxmolecularweight=1.04x260.04=270.4grams
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Question 4 q a




qa Clickthis linktoaccess thePeriodic Table. Thismay be helpful throughout the
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qa exam.