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You will get a different set of questions each time you attempt this quiz.

You will get a different set of questions each time you attempt this quiz.

- A mole of a substance is defined as
- the amount of substance that contains as many particles as there are in 12 grams of the C-12 isotope.
- the amount of substance contained in 12 grams of carbon.
- the amount of substance in 16 grams of oxygen.
- the number of atoms in 12 grams of carbon.

- The sum of the relative atomic masses of all the atoms in a molecule is known as
- its relative molecular mass
- the Avogadro number
- a mole
- its molar volume

- One mole of a substance contains
- 6.0 x 10
^{23}particles of that substance. - 6.2 x 10
^{32}particles of that substance. - 6.23 x 10 particles of that substance.
- 10 x 6
^{23}particles of that substance.

- 6.0 x 10
- For the chemical reaction shown, how many moles of NH
_{3}are formed when 2 moles of N_{2}react with 8 moles of H_{2}?

N_{2}+ 3H_{2}⇌ 2NH_{3}- 4 moles
- 1 mole
- 3 moles
- 2 moles

- How many atoms are there in 2.5 moles of Gold (Au)?
- 1.5 x 10
^{24} - 1.5 x 10
^{23} - 3.0 x 10
^{23} - 3.0 x 10
^{24}

- 1.5 x 10
- There are 3 x 10
^{23}molecules in a sample of hydrogen (H_{2}) gas.

How many moles of H_{2}are there in this sample?- 0.5 mole
- 3 moles
- 5 moles
- 0.3 mole

- How many atoms are there in 1.5 moles of sulfur dioxide (SO
_{2})?- 2.7 x 10
^{24} - 9.0 x 10
^{23} - 9.0 x 10
^{24} - 2.7 x 10
^{23}

- 2.7 x 10
- If the molar volume of a gas at STP is 22.4 litres, how many moles are there in 112 litres of hydrogen gas?
- 5 moles
- 10 moles
- 2 moles
- 20 moles

- The average mass of a molecule of a substance relative to one-twelfth the mass of a carbon-12 atom is known as
- the relative molecular mass.
- the relative atomic mass.
- a mole of a that substance.
- the molar mass of that substance.

- The mass in grams of a mole of a substance is known as
- molar mass.
- molar volume.
- relative molecular mass.
- a mole.

- The relative atomic mass of hydrogen is 1, and that of oxygen is 16, and that of sulfur is 32. What is the relative molecular mass of sulfuric acid (H
_{2}SO_{4})?- 98
- 49
- 66
- 96

- There are 22,400 cm
^{3}in a mole of any gas at STP. How many cm^{3}are there in 0.05 mole of a gas at STP?- 1,120 cm
^{3} - 112 cm
^{3} - 44,800 cm
^{3} - 448 cm
^{3}

- 1,120 cm
- The relative atomic masses of sodium, oxygen and hydrogen are 23, 16 and 1 respectively. How many grams are there in 0.5 mole of sodium hydroxide (NaOH)?
- 20 grams
- 40 grams
- 38 grams
- 17 grams.

- Which one of the following instruments is used for determining the relative molecular mass of a substance?
- Mass spectrometer
- Hofmann voltameter
- Cathode ray tube
- Geiger-Muller tube

- The molar mass of a substance is defined as
- the mass in grams of 1 mole of that substance.
- the mass in grams of 1 litre of that substance.
- the number of moles in 1 litre of that substance.
- the number of moles in 1 kilogram of that substance.

- If Avogadro's Number is 6 x 10
^{23}, then how many__atoms__are there in 2.5 moles of hydrogen gas (H_{2})?- 3.0 x 10
^{24} - 3.0 x 10
^{23} - 1.5 x 10
^{23} - 1.5 x 10
^{24}

- 3.0 x 10
- If the molar volume of methane (CH
_{4}) is 22,400 cm^{3}and its molar mass is 16 grams, then how many grams of methane are there in 112 cm^{3}of methane gas?- 0.08 gram
- 0.8 gram
- 1400 grams
- 20 grams

- What will the mass of 5,600 cm
^{3}of nitrogen gas (N_{2}) be at STP? {M_{r}(N_{2}) = 28 and molar volume at stp = 22,400 cm^{3}}- 7 grams
- 14 grams
- 28 grams
- 112 grams

- What is the amount of atoms, in moles, in 88 g of carbon dioxide?
- 6
- 1.024 ×10
^{24} - 6.02 ×10
^{23} - 1

- The isotopic abundances for an element R, are

What is the relative atomic mass of element R?- 28.8
- 28.2
- 28.5
- 14

- How many molecules are present in a 9.0 g sample of water?
- 3.0 ×10
^{23} - 6.0 ×10
^{23} - 1.0
- 0.5

- 3.0 ×10
- What is the coefficient for oxygen when this equation is balanced using the lowest whole number?

C_{4}H_{10}→ CO + H_{2}O- 9
- 4
- 5
- 13

- What is the maximum mass of iron that can be produced from the reduction of 80 tonnes of iron(III) oxide (Mr = 160) , based on the following equation?

Fe_{2}O_{3}+ 3CO → 2Fe + 3CO_{2}- 56 tonnes
- 28 tonnes
- 84 tonnes
- 112 tonnes

- Which expression gives the number of moles of a substance, if the mass is given in grams?
- Mass ÷ Molar mass
- Molar mass ÷ Mass
- 1 ÷ Molar mass
- Mass × Molar mass

- What is the total number of atoms in 0.20 mol of propanone, CH
_{3}COCH_{3}?- 1.2 ×10
^{24} - 6.0 ×10
^{23} - 1.2 ×10
^{22} - 6.0 ×10
^{24}

- 1.2 ×10
- Ethyne, C
_{2}H_{2}, reacts with oxygen according to the equation below. What volume of oxygen (in dm^{3})

reacts with 0.40 dm^{3}of C_{2}H_{2}?

2C_{2}H_{2}+ 5O_{2}→ 4CO_{2}= 2H_{2}O- 1.0
- 0.80
- 0.40
- 2.0

- When the equation below is balanced for 1 mol of C
_{3}H_{4}, what is the coefficient for O_{2}?

C_{3}H_{4}+ _O_{2}→ _CO_{2}+ _H_{2}O- 4
- 2
- 3
- 5

- The equation for the complete combustion of butane is

2C_{4}H_{10}+ 13O_{2}→ 8CO_{2}+10H_{2}O

How many moles of of carbon dioxide are formed by the complete combustion of three moles of butane?- 12
- 4
- 8
- 24

- A reaction occurring in the extraction of lead from its ore can be represented by this unbalanced equation:

__ PbS + __O_{2}→ __ PbO+ __ SO_{2}

When the equation is balanced using the smallest possible whole numbers, what is the coefficient of O_{2}- 3
- 2
- 1
- 4

- The equation for a reaction occurring in the synthesis of methanol is

CO_{2}+ 3H_{2}→ CH_{3}OH + H_{2}O

What is the maximum amount of methanol that can be formed from 2 mol of carbon dioxide and 3 mol of hydrogen?- 1 mol
- 2 mol
- 3 mol
- 5 mol

- Calcium carbonate decomposes on heating as shown below:

CaCO_{3}→ CaO + CO_{2}- 25%
- 7%
- 50%
- 75%

- Sodium reacts with water as shown below:

_Na + _H_{2}O → _NaOH + H_{2}

What is the**total**of all the coefficients when the equation is balanced using the smallest possible whole numbers?- 7
- 6
- 4
- 3

- Consider the following reaction:

2C_{4}H_{10}+ 13O_{2}→ 8CO_{2}(g)+10H_{2}O

How many moles CO_{2}of are produced by the complete combustion of 58 g of butane (C_{4}H_{10})?- 4
- 8
- 12
- 16

- What volume of 0.50 mol dm
^{−3}HCl(aq) is required to react completely with 10.0 g of calcium carbonate according to the following equation?

CaCO_{3}+ 2HCl → CaCl_{2}+ H_{2}O + CO_{2}- 400 cm
^{3} - 200 cm
^{3} - 300 cm
^{3} - 100 cm
^{3}

- 400 cm
- How many hydrogen atoms are there in one mole of ethanol, C
_{2}H_{5}OH?- 3.6 ×10
^{24} - 1.0 ×10
^{23} - 5
- 6

- 3.6 ×10
- The percentage by mass of the elements in a certain compound is

C = 72%, H =12%, O =16%

What is the mole ratio of C:H:O in the empirical formula of this compound?__Relative atomic masses__:

H = 1, C = 12, O = 16- 6:12:1
- 1:12:1
- 1:12:6
- 6:1:12

- What is the coefficient for O
_{2}when the equation below is balanced?

C_{3}H_{8}+ __O_{2}→ __CO_{2}+ __H_{2}O- 5
- 2
- 3
- 7

- How many oxygen atoms are present in 0.0500 mol carbon dioxide?
- 6.02×10
^{22} - 3.01×10
^{22} - 6.02×10
^{23} - 1.20×10
^{24}

- 6.02×10
- A certain sample of the element X contains 60% of X-69 and 40% of X-71 isotopes.

What is the relative atomic mass of this element?- 69.8
- 69.2
- 70.0
- 70.2

- How many litres of nitrogen dioxide gas could theoretically be obtained in the reaction of 1 litre of nitrogen monoxide gas with 2 litres of oxygen gas?

(All volumes are measured under the same conditions of temperature and pressure.)

2NO_{(g)}+ O_{2(g)}→ 2NO_{2(g)}- 1
- 2
- 3
- 4

- Calcium carbonate reacts with nitric acid as follows:

CaCO_{3(s)}+ 2HNO_{3(aq)}→ Ca(NO_{3})_{2(aq)}+ H_{2}O_{(l)}+ CO_{2(g)}

0·05 mol of calcium carbonate was added to a solution containing 0·08 mol of nitric acid.

Which of the following statements is true?- Calcium carbonate is in excess by 0·01 mol.
- Nitric acid is in excess by 0·03 mol.
- 0·05 mol of carbon dioxide is produced.
- 0·08 mol of calcium nitrate is produced.

- A hydrocarbon contains 90 % by mass of carbon.

What is its empirical formula?__Relative atomic masses__:

H = 1, C = 12- C
_{3}H_{4} - CH
_{2} - C
_{7}H_{10} - C
_{9}H_{10}

- C
- Lithium hydroxide reacts with carbon dioxide as follows:

2LiOH + CO_{2}→ Li_{2}CO_{3}+ H_{2}O

What mass (in grams) of lithium hydroxide is needed to react with 11 g of carbon dioxide?__Relative atomic masses__:

H = 1, Li = 7, C = 12, O = 16- 12
- 6
- 24
- 48

- A given number of moles of a gas at a constant temperature will
- increase its volume if the pressure decreases.
- increase its volume if the pressure increases.
- decrease its volume if the pressure decreases.
- have a constant volume if the pressure changes.

- Which of the following is
**not**conserved during a chemical reaction?- The number of molecules
- The mass
- The number of electrons
- The number of atoms