CHEM 103 MODULE 2 EXAM 2022- UPDATED

CHEM 103
MODULE 2 EXAM 2022

Question 1
Click this link to access the Periodic Table. This may be helpful throughout
the exam.


Show the calculation of the molecular weight for the following
compounds, reporting your answer to 2 places after the decimal.


1. Al2(CO3)3


2. C8H6NO4Cl


1. 2Al + 3C + 9O = 233.99

, 2. 8C + 6H + N + 4O + Cl = 215.59

Question 2
Click this link to access the Periodic Table. This may be helpful throughout
the exam.


Show the calculation of the number of moles in the given amount of the
following substances. Report your answerto 3 significant figures.


1. 13.0 grams of (NH4)2CO3


2. 16.0 grams of C8H6NO4Br

1. Moles = grams / molecular weight = 13..09 = 0.135 mole


2. Moles = grams / molecular weight = 16..04 = 0.0615 mole

Question 3
Click this link to access the Periodic Table. This may be helpful throughout
the exam.


Show the calculation of the number of grams in the given amount of the
following substances. Report your answer to 1 place after the decimal.


1. 1.20 moles of (NH4)2CO3


2. 1.04 moles of C8H6NO4Br

1. Grams = Moles x molecular weight = 1.20 x 96.09 = 115.3 grams


2. Grams = Moles x molecular weight = 1.04 x 260.04 = 270.4 grams

Question 4
Click this link to access the Periodic Table. This may be helpful throughout
the exam.