01 Oct One half of a mole of atoms would contain how many atoms?
CHEM1305 Introductory Chemistry
Chapter 8 Homework Assignment
Question 1One half of a mole of atoms would contain how many atoms?
6.02 × 1023 atoms
6 atoms
3.01 × 1023 atoms
144 atoms
Question 2Calculate the number of particles in 0.200 mol of chlorine molecules, Cl2.
6.02 × 1023 molecules
7.09 molecules
35.45 molecules
1.2 × 1023 molecules
Question 3Calculate the number of moles in 3.00 × 1024 formula units of manganese(II) sulfate, MnSO4.
151.00 moles
4.98 moles
6.02 × 1023 moles
2.00 × 1023 moles
Question 4Determine the molar mass for each of the following:
a) silicon, Si28.09 g/mol
b) ozone, O348.0 g/mol
c) iron(II) acetate, Fe(C2H3O2)2173.93 g/mol
d) nitroglycerin, C3H5O3(NO2)3227.09 g/mol
Question 5How many moles of dinitrogen oxide, N2O are in a 19.3 g sample of N2O?
6.43 moles
2.28 moles
0.439 moles
19.3 moles
Question 6What is the mass of 61.5 moles of zinc, Zn?
0.941 g
1.06 g
4021 g
61.5 g
Question 7Calculate the number of molecules in 5.68 g propane, C3H8.
7.75 × 1022 molecules
0.129 molecules
2.33 × 1024 molecules
5.68 molecules
Question 8What is the mass percent of C in oxalic acid, H2C2O4?
12.01 %
26.7 %
13.3 %
33.3 %
Question 9An iron phosphide compound contains 335 grams of iron and 124 grams of phosphorus. What is the empirical formula of this compound?
Fe6P4
FeP
Fe3P2
Question 10Hexamethylene diamine has a molar mass of 115 g/mol and an empirical formula of C3H8N. What is the molecular formula of the compound?
Correct!
C6H16N2
C9H24N3
C3H8N
C1.5H4N0.5
