Unit 6 – Moles and Solutions Homework
Moles Practice
1.
How many moles of aluminum are in 5.34g of Al?
2.
How many grams of silicon are in 1.452 mol Si?
3.
How many atoms are in 9.381 mol of Zinc?
4.
How many moles of sodium chloride are in 6.21g of sodium chloride?
5.
How many molecules of methane are in 0.850 mol methane?
Moles and Molarity Practice #1
1.
How many molecules of phosphorus trichloride are in 53.4g?
2.
What is the mass (in grams) of 4.56x10
21 formula units of sodium carbonate?
3.
How many liters of a 0.51M NaCl solution are necessary to have 1.38 mol of NaCl?
4.
How many moles of H
2
SO
4 are in 4.8mL of a solution where [H
2
SO
4
] = 18.1M?
5.
A typical solution made for swishing with salt water would be made with about 10.0g of sodium chloride in about 240mL of water. What is the [NaCl] in this solution?
Moles and Molarity Practice #2
1.
How many formula units of calcium chloride are in 0.521g of calcium chloride?
2.
What is the mass in grams of 8.43x10
24 molecules of methane?
3.
7.91 g of sodium carbonate is dissolved in enough water to make 200.0mL of solution. What is the [Na
2
CO
3
] of the solution?
4.
How many mL of a 1.29M H
2
SO
4 solution are required to have 0.0251mol H
2
SO
4
?
5.
How many mol of Epsom salt are in 124mL of 0.250M Epsom salt?
Dilution Practice
1.
What is the molarity of a solution created by diluting 12.0mL of 18.0M H
2
SO
4 to 500.0mL of solution?
2.
What volume of 6.0M NaOH is required to make 200.0mL of 0.500M NaOH?
3.
35.0mL of a solution of unknown concentration is diluted to 500.0mL. Later testing shows the diluted solution is 0.121M MgSO
4
. What was the original [MgSO
4
]?
4.
You are nearly out of concentrated hydrochloric acid (12.0M HCl(aq)) and have only 24.5mL left. How much 0.100M HCl(aq) can you make?
5.
What volume of 15.0M H
3
PO
4 is required to make 2.0L of 0.200M H
3
PO
4
?
Moles and Solutions Practice
1.
What is the mass in grams of 9.43x10
23 formula units of magnesium nitride?
2.
What mass of sodium chloride is required to create 265mL of a 0.210 M salt solution?
3.
How many molecules of HCl are dissolved in 3.00mL of 12.0M HCl?
4.
In one cup of skim milk (236.6mL), there are typically 0.306g of Ca
2+ ions. What is the [Ca
2+
] in milk?
5.
15.2mL of 2.19M calcium chloride is diluted to 325mL. What is the [CaCl
2
] of the diluted solution?
Counting Atoms Practice
1.
How many aluminum ions are in 1.50x10
22 formula units of aluminum oxide?
2.
How many hydrogen atoms are in 4.50g of methane?
3.
What volume in mL of 6.00M HCl contains 5.0x10
22 chlorine atoms?
4.
How many carbon atoms are in 50.0mL of a 0.200M sucrose (C
12
H
22
O
11
) solution?
5.
What mass of carbon dioxide is necessary to obtain 2.00x10
24 oxygen atoms