OCR Chemistry A - 'Amount of Substance' 2.1.1 e-g

What mass of iron is produced when 32.0kg of iron (III) oxide is heated with CO?

Fe₂O_3(s) + 3 CO_(g) --> 2 Fe_(s) + 3 CO_2(g)

• 11200 g

• 22400 g

• 201 g

• 401 g

What mass of oxygen is needed to convert 102 g of ammonia into nitrogen?

4 NH_3(g) + 3 O_2(g) --> 2 N_2(g) + 6 H₂O(_g)

• 144 g

• 192 g

• 256 g

• 128 g

What volume of oxygen reacts with 100 cm³ of but-1-ene at RTP?

C₄H_8(g) + 6 O_2(g) --> 4 CO_2(g) + 4 H₂O_(l)

• 400 cm³

• 250 cm³

• 800 cm³

• 600 cm³

What volume of oxygen is used when 200cm³ of ethane combusts?

C₂H_6(g) + 3.5 O_2(g) --> 2 CO_2(g) + 3 H₂O_(l)

• 350 cm³

• 175 cm³

• 400 cm³

• 700 cm³

Calculate the volume of 0.05 mol dm^-3 KOH that is required to neutralise 25.0 cm³ of 0.030 mol dm^-3 HNO₃

HNO₃ + KOH --> KNO₃ + H2O

Give your answer in cm³ to 3sf.

A 250 cm³ solution of NaOH was prepared. 25.0 cm³ of this solution required 27.4 cm³ of 0.100 mol dm^-3 HCl for neutralisation.

Calculate what mass of NaOH was dissolved to make up the original 250 cm³ solution.

HCl + NaOH --> NaCl + H₂O

Give your answer in grams to 3sf.

If I have 72 dm³ of ammonia gas held at 340 kPa and 225 K, how many moles do I have?

• 0.08 mol

• 0.17 mol

• 5.99 mol

• 13.09 mol

1.9 moles of xenon gas is held at 500kPa with a volume of 50dm³. What is the temperature?

• 231.4 K

• 1309.5 K

• 1309.5 ^oC

• 504.4 K

My hydrogen-powered car has 3 moles of H, of 0.06m³ and it's at 400K, what is the pressure?

• 1247900 Pa

• 5 kPa

• 150 kPa

• 166 kPa

If I have 21 moles of iodine gas held at 7800KPa and 900 K, what is the volume of the iodine?

• 2.01 dm³

• 2.01 m³

• 20.1 dm³

• 14.1 dm³