Pierce College » Chemistry » Chemistry 060 - Introduction to General Chemistry » Fall 2020

Question #1

Which of the following contain the greatest number of atoms?

A. 3.41 moles O

B. 0.865 moles N2O

C. 1.37 moles O3

D. 2.24 moles O2

E. 1976 molecules H2O

Question #2

How many grams of nitrogen are in 3.57 g of N2O? do not include units

A. 2.47

B. 2.57

C. 2.29

D. 2.27

Question #3

How many oxygen atoms are in two K2SO4 formula units?

A. 8

B. 4

C. 6

D. 10

Question #4

How many grams are in 3.29 x 1021 CO2 molecules?

A. 0.21

B. 0.24

C. 0.22

D. 0.25

Question #5

How many moles are in 1.34 x1021 carbon atoms?

A. 0.0011

B. 0.0023

C. 0.0022

D. 0.0021

Question #6

What is the mass percent of oxygen in NaNO3? Give answer to three significant figures.

A. 56.6

B. 56.5

C. 55.5

D. 56.4