Set 7 – Gas Volumes in Mole Calculations

When ammonia gas is passed over heated iron wool it decomposes completely into nitrogen and hydrogen

2NH₃ <=>N₂ + 3H₂

Assume all volumes are measured at the same temperature and pressure.

250cm³ of ammonia was passed, forwards and backwards, over heated iron wool from one graduated syringe to another until there was no further volume change.

What was the final volume of gas in the syringes?

What volume of oxygen is required for complete combustion of 1 dm³ of methane?

CH₄ + 2O₂ => CO₂ + 2H₂O

Assume all volumes are measured at the same temperature and pressure:

What volume (measured under r.t.p. of oxygen will be produced by complete thermal decomposition of 4.25g of sodium nitrate?

2NaNO₃ => 2NaNO₂ + O₂

A piece of magnesium was reacted with an excess of steam. 600cm³ (measured under r.t.p.) of hydrogen were produced.

What was the mass of the piece of magnesium?

What volume (measured under r.t.p.) of hydrogen will be formed if 15.0g of magnesium is reacted with an excess of steam?

The reaction between heated magnesium and steam can be represented by the equation:

Mg + H₂O => MgO + H₂

What volume (measured under standard conditions) of hydrogen will be formed by the reaction of 0.200 mole of magnesium with an excess of steam?

What is the mass of 120 cm³ of nitrogen if all volumes are measured at r.t.p?

What is the mass of 0.600 dm³ of ammonia if all volumes are measured at r.t.p?

What is the mass of 24.0 dm³ of hydrogen sulphide if all volumes are measured at r.t.p?

How many moles of molecules are present in 300cm³ of chlorine? (all volumes measured at r.t.p.)

How many moles of molecules are present in 0.120 dm³ of oxygen? (all volumes measured at r.t.p.)

How many moles of molecules are present in 2.40 dm³ of argon? (all volumes measured at r.t.p.)

How many moles of molecules are present in 48.0 dm³ of butane? (all volumes measured at r.t.p.)

How many moles of molecules are present in 24.0 dm³of carbon dioxide? (all volumes measured at r.t.p.)

What is the volume (in dm³) occupied at room temperature and pressure (r.t.p:298K and 100KPa) of 1.00 mole of oxygen molecules?

What is the volume (in dm³) occupied at room temperature and pressure (r.t.p:298K and 100KPa) of 1.00 mole of fluorine molecules?

What is the volume (in dm³) occupied at room temperature and pressure (r.t.p:298K and 100KPa) of 2.00 moles of nitrogen molecules?

What is the volume (in dm³) occupied at room temperature and pressure (r.t.p:298K and 100KPa) of 0.500moles of methane?

What is the volume (in dm³) at room temperature and pressure of 71.0g of chlorine?

What is the volume (in dm³) at room temperature and pressure of 1.00g of hydrogen?

What is the volume (in dm³) at room temperature and pressure of 1.00g of neon?

What is the volume (in dm³) at room temperature and pressure of 70.0g of carbon monoxide?

What is the volume (in dm³) at room temperature and pressure of 11.0g of propane?