I need help from question 2 d) to question 10 f)

More Grade 11 Review

1. Calculate the percent composition of sodium thiosulfate, Na2S2O3

1. Use this equation for all three problems:

2 H2 (g) + O2 (g) → 2H2O (g)

a) How many moles of water are produced when 5.00 moles of oxygen are consumed?

b) If 3.00 moles of water are produced, how many grams of oxygen must be consumed?

c) How many moles of hydrogen must be used, given the data in problem b)?

d) What mass of water is produced when 105 g of hydrogen reacts with excess oxygen?

1. What mass of sodium carbonate must be used to produce 10.36 L of carbon dioxide at 24°C and 103 kPa according to the following neutralization reaction?

HCl (aq) + Na2CO3 (s) → NaCl (aq) + CO2 (g) + H2O (l)

1. If 129.0 g of oxygen gas and 300 g of propane are mixed and allowed to react as shown below, determine the volume of water vapour formed at 116 kPa and 120°C.

C3H8 (g) + O2 (g) → CO2 (g) + H2O (g)

1. 25 g of sodium chloride is dissolved in 100 g of water. What is the concentration in % by mass?

1. What mass of lead (II) nitrate is required to make 4.5 L of a 0.75 mol/L solution?

1. A sample of gas has a volume of 54.0 L at 22oC. What will the volume be if it is cooled to -50oC?

1. The pressure on 925 mL of a gas is 120 kPa. What must the pressure be changed to in order to make the volume 0.700 L?

2. A 50.0 L volume of gas is at 42oC and 87.0 kPa. Calculate the temperature required to change the volume to 42.5 L at a pressure of 770 mmHg.

3. Calculate the number of:

   1. moles in 45.2 L of carbon dioxide gas at STP

   2. molecules in 45.2 L of carbon dioxide gas at STP

   3. moles in 45.2 L of oxygen gas at STP.

   4. moles in 45.2 L of carbon dioxide gas at 25oC and 97.0 kPa.

   5. moles in 45.2 g of carbon dioxide gas at STP

   6. moles in 45.2 g of oxygen gas at STP.

Answers:

1. Complete the following table.