Student’s name:
Professor:
Class: CHM1032
Date: July 11, 2021
Critical Thinking Assignment 8
1. What is the mass percent of sodium hydroxide in a solution that is made by adding
5.00 g NaOH in 100.0 g of H2O?
Grams of Solute
𝑚𝑁𝑎𝑂𝐻
5
Mass Percent = Grams of Solution x 100 = 𝑚(𝑁𝑎𝑂𝐻+H2O) 𝑥 100 = (5+100) 𝑥 100 =
4.76 %
2. What masses of sodium chloride and water are need to make 500. g of a 4.00%
solution?
Grams of Solute
Mass Percent = Grams of Solution x 100 => Grams of solution =
=
500
4
Grams of Solute
Mass Percent
x 100
x 100 = 12,500 g
3. What is the molarity of a solution that contains 4.3 mol of acetic acid (C2H3O2) in
450. mL of solution?
𝑛
M=𝑉=
4.3
0.450
= 9.56 M
4. What volume of a 0.150 M solution can be prepared from 15.0 g of lithium
carbonate?
We have molar mass of Li2CO3: 73.891 g/mol
𝑛
M = 𝑉 => 𝑉 =
𝑛
=
𝑀
15
73.891
0.15
=
0.20
0.15
= 1.3 𝑙𝑖𝑡𝑒𝑟
5. What volume of 0.025 M MgCO3 can be made from 10.0 g of MgCO3?
We have molar mass of MgCO3: 84.3139 g/mol
𝑛
M = 𝑉 => 𝑉 =
𝑛
=
𝑀
10
84.3139
0.025
=
0.12
0.025
= 4.8 𝑙𝑖𝑡𝑒𝑟