Practise exam questions on calculating molar mass and molar gas volume calculations for AQA, Edexcel and OCR GCSE level and advanced A level chemistry courses Doc Brown's chemistry calculations

Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
Calculate the volume of hydrogen formed in dm³ when 2.3g of sodium reacts with water. (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-1]
1. 1.2
2. 2.4
3. 4.8
4. 0.6
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
Calculate the volume of hydrogen formed in dm³ when 9.2g of sodium reacts with water. (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-2]
1. 2.4
2. 4.8
3. 9.6
4. 1.2
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
What mass of sodium in g will form 600 cm³ of hydrogen gas? (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-3]
1. 2.30
2. 2.40
3. 1.15
4. 4.60
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
What mass of sodium in g will form 18 dm³ of hydrogen gas? (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-4]
1. 23.0
2. 46.0
3. 16.5
4. 34.5
Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What volume of carbon dioxide in dm³ is formed when 10g of limestone is heated strongly? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-5]
1. 2.4
2. 4.8
3. 1.2
4. 4.4
Given the equation for the thermal decomposition of calcium carbonate (limestone) ...
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What volume of carbon dioxide in dm³ is formed when 200g of limestone is heated strongly? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-6]
1. 24
2. 48
3. 12
4. 96
Given the equation for the thermal decomposition of calcium carbonate (limestone) ...
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What mass of limestone in g, on strong heating, will form 6 dm³ carbon dioxide? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-7]
1. 50
2. 56
3. 25
4. 12
Given the equation for the thermal decomposition of calcium carbonate (limestone) ...
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What mass of limestone in g, on strong heating, will form 120 cm³ carbon dioxide? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-8]
1. 0.3
2. 1.0
3. 2.0
4. 0.5
5 g of a gas had a volume of 60 dm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-9]
1. 2
2. 6
3. 4
4. 12
What is the volume in dm³ of 8 g of a gas of molecular mass 16? (1 mol gas = 24 dm³ at room temp./press.) [mvg-10]
1. 6
2. 12
3. 0.5
4. 2
What mass of gas, of molecular mass 36.5, is present in 4.8 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-11]
1. 14.6
2. 3.65
3. 7.30
4. 0.76
0.145 g of a gas had a volume of 60 cm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-12]
1. 29
2. 30
3. 116
4. 58
What is the volume in dm³ of 0.85 g of a gas of molecular mass 17? (1 mol gas = 24 dm³ at room temp./press.) [mvg-13]
1. 1.2
2. 0.6
3. 2.4
4. 3.4
What mass of gas, of molecular mass 71, is present in 1.2 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-14]
1. 14.2
2. 3.55
3. 7.10
4. 8.52
2.55g of a gas had a volume of 0.6 dm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-15]
1. 17
2. 51
3. 102
4. 34
What is the volume in dm³ of 1 g of a gas of molecular mass 96? (1 mol gas = 24 dm³ at room temp./press.) [mvg-16]
1. 4.00
2. 0.50
3. 1.92
4. 0.25
What mass of gas, of molecular mass 44, is present in 0.15 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-17]
1. 0.275
2. 6.600
3. 3.600
4. 0.003
What is the volume in dm³ of 0.8 g of a gas of molecular mass 32? (1 mol gas = 24 dm³ at room temp./press.) [mvg-18]
1. 0.025
2. 0.6
3. 19.2
4. 1.33
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What mass of magnesium in g, will form 1.2 dm³ of hydrogen gas? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-19]
1. 28.8
2. 0.6
3. 1.2
4. 2.4
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What mass of magnesium in g, will form 36 dm³ of hydrogen gas? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-20]
1. 24
2. 12
3. 72
4. 36
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What volume of hydrogen gas, in dm³, is formed when 4g of magnesium dissolves in the acid? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-21]
1. 4
2. 2
3. 6
4. 3
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What volume of hydrogen gas, in dm³, is formed when 72g of magnesium dissolves in the acid? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-22]
1. 36
2. 72
3. 48
4. 24
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What mass of aluminium (g) dissolves when 7.2 dm³ of hydrogen is formed? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-23]
1. 2.7
2. 0.3
3. 5.4
4. 16.2
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What mass of aluminium in g, dissolves when 48 dm³ of hydrogen is formed? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-24]
1. 18
2. 6
3. 18
4. 36
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What volume of hydrogen, in dm³, is formed, when 54g of aluminium dissolves? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-25]
1. 72
2. 24
3. 48
4. 36
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What volume of hydrogen, in dm³, when 27g of aluminium dissolves? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-26]
1. 12
2. 36
3. 18
4. 24
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) + H₂O_(l) + CO_2(g)
Calculate the volume of carbon dioxide, in dm³, when 5 g of calcium carbonate dissolves in the acid. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-27]
1. 2.4
2. 0.6
3. 1.2
4. 1.8
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) + H₂O_(l) + CO_2(g)
Calculate the volume of carbon dioxide, in dm³, when 400 g of calcium carbonate dissolves in the acid. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-28]
1. 48
2. 6
3. 24
4. 96
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) + H₂O_(l) + CO_2(g)
Calculate the mass of calcium carbonate (in g) that dissolves when 6 dm³ of carbon dioxide is formed. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-29]
1. 25.0
2. 12.5
3. 6.0
4. 100.0
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) + H₂O_(l) + CO_2(g)
Calculate the mass of calcium carbonate (in g) that dissolves when 36 dm³ of carbon dioxide is formed. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-30]
1. 66
2. 150
3. 100
4. 44
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
Calculate the volume of hydrogen formed in dm³ when 2.3g of sodium reacts with water. (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-1]
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
Calculate the volume of hydrogen formed in dm³ when 9.2g of sodium reacts with water. (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-2]
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
What mass of sodium in g will form 600 cm³ of hydrogen gas? (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-3]
Given the equation: 2Na_(s) + 2H₂O_(l) ==> 2NaOH_(aq) + H_2(g)
What mass of sodium in g will form 18 dm³ of hydrogen gas? (A_r's Na=23, H=1, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-4]
Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What volume of carbon dioxide in dm³ is formed when 10g of limestone is heated strongly? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-5]
Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What volume of carbon dioxide in dm³ is formed when 200g of limestone is heated strongly? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-6]
Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What mass of limestone in g, on strong heating, will form 6 dm³ carbon dioxide? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-7]
Given the equation for the thermal decomposition of calcium carbonate (limestone):
CaCO_3(s) ==> CaO_(s) + CO_2(g)
What mass of limestone in g, on strong heating, will form 120 cm³ carbon dioxide? (A_r's Ca=40, C=12, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-8]
5 g of a gas had a volume of 60 dm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-9]
What is the volume in dm³ of 8 g of a gas of molecular mass 16? (1 mol gas = 24 dm³ at room temp./press.) [mvg-10]
What mass of gas, of molecular mass 36.5, is present in 4.8 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-11]
0.145 g of a gas had a volume of 60 cm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-12]
What is the volume in dm³ of 0.85 g of a gas of molecular mass 17? (1 mol gas = 24 dm³ at room temp./press.) [mvg-13]
What mass of gas, of molecular mass 71, is present in 1.2 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-14]
2.55g of a gas had a volume of 0.6 dm³. What is its molecular mass? (1 mol gas = 24 dm³ at room temp./press.) [mvg-15]
What is the volume in dm³ of 1 g of a gas of molecular mass 96? (1 mol gas = 24 dm³ at room temp./press.) [mvg-16]
What mass of gas, of molecular mass 44, is present in 0.15 dm³ of the gas? (1 mol gas = 24 dm³ at room temp./press.) [mvg-17]
What is the volume in dm³ of 0.8 g of a gas of molecular mass 32? (1 mol gas = 24 dm³ at room temp./press.) [mvg-18]
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What mass of magnesium in g, will form 1.2 dm³ of hydrogen gas? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-19]
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What mass of magnesium in g, will form 36 dm³ of hydrogen gas? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-20]
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What volume of hydrogen gas, in dm³, is formed when 4g of magnesium dissolves in the acid? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-21]
Given the equation for magnesium dissolving in hydrochloric acid:
Mg_(s) + 2HCl_(aq) ==> MgCl_2(aq) + H_2(g)
What volume of hydrogen gas, in dm³, is formed when 72g of magnesium dissolves in the acid? (A_r's Mg=24, H=1, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-22]
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What mass of aluminium in g, dissolves when 7.2 dm³ of hydrogen is formed? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-23]
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What mass of aluminium in g, dissolves when 48 dm³ of hydrogen is formed? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-24]
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What volume of hydrogen, in dm³, is formed, when 54g of aluminium dissolves? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-25]
Given the equation for aluminium dissolving in dilute sulphuric acid:
2Al_(s) + 3H₂SO_4(aq) ==> Al₂(SO₄)_3(aq) + 3H_2(g)
What volume of hydrogen, in dm³, when 27g of aluminium dissolves? (A_r's: Al=27, H=1, S=32, O=16, 1 mol gas = 24 dm³ at room temp./press.) [mvg-26]
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) H₂O_(l) + CO_2(g)
Calculate the volume of carbon dioxide, in dm³, when 5 g of calcium carbonate dissolves in the acid. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-27]
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) H₂O_(l) + CO_2(g)
Calculate the volume of carbon dioxide, in dm³, when 400 g of calcium carbonate dissolves in the acid. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-28]
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) H₂O_(l) + CO_2(g)
Calculate the mass of calcium carbonate (in g) that dissolves when 6 dm³ of carbon dioxide is formed. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-29]
Given the equation for calcium carbonate dissolving in hydrochloric acid:
CaCO_3(s) + 2HCl_(aq) ==> CaCl_2(aq) H₂O_(l) + CO_2(g)
Calculate the mass of calcium carbonate (in g) that dissolves when 36 dm³ of carbon dioxide is formed. (A_r's: Ca=40, C=12, O=16, Cl=35.5, 1 mol gas = 24 dm³ at room temp./press.) [mvg-30]

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9. GCSE level practice exam questions on molar mass and molar gas volume calculations