3 Quantitative Flashcards

1
Q

If 24 g of magnesium reacts with 16 g of oxygen to produce 40 g of magnesium oxide, what mass of magnesium would you need to start with to produce 10 g of magnesium oxide?

A

6g

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2
Q

What is the relative formula mass of calcium carbonate, CaCO3?

A

100

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3
Q

The relative formula mass of CaO is 56 and the relative formula mass of CO2 is 44. Work out the mass of CaO that can be obtained from 200 g of CaCO3. CaCO3 ? CaO + CO2.

A

112 g

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4
Q

What mass of CO2 will be produced when 50 g of CaCO3 decomposes?

A

22 g

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5
Q

What is 20 cm3 in dm3?

A

0.020 dm3

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6
Q

What is the concentration of a solution if 0.25 mol is dissolved in 500 cm3 of solution?

A

0.5 moldm-3

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7
Q

How many moles of solute are there in 25 cm3 of a solution that has a concentration of 0.4 mol/dm3?

A

0.01 moles

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8
Q

If a solution of NaOH is 0.1 mol/dm3, what is its concentration in g/dm3?

A

4 g/dm3

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9
Q

In a reaction, the predicted yield was 80 g, but the actual yield was 60 g. What was the percentage yield?

A

75%

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10
Q

What is the percentage yield if the actual yield was 2.4 g and the predicted yield was 3.0 g?

A

80%

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11
Q

__ H2 + O2 –> __ H2O

A

2 H2 + O2 –> 2H2O

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12
Q

__ Na + __ H2O –> __ NaOH + __H2

A

2Na + 2H2O –> 2NaOH + 1H2

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13
Q

__ Zn + __ S –> __ ZnS

A

1Zn + 1S –> 1ZnS

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14
Q

__ Ca + __ HCl –> __ CaCl2 + __ H2

A

1 Ca + 2HCl –> 1 CaCl2 + 1 H2

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15
Q

__ Al + __ Cl2 –> __ AlCl3

A

2Al + 3Cl2 –> 2 AlCl3

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16
Q

__ Al + __ O2 –> __ Al2O3

A

4Al + 3O2 –> 2 Al2O3