Free Printable 3.2 Mole concept

1.

Calculate the number of moles of

4.5\times10^{23}

nitrogen molecules,

N_2

.

\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]

a)

0.75

b)

0.65

c)

0.55

d)

0.45

2.

Calculate the number of particles in

3.5 mol of lead, Pb.

\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]

a)

$3.5\times10^{23\ }atoms$

b)

$2.1\times10^{24}\ atoms$

c)

$3.5\times10^{23\ }ions$

d)

$2.1\times10^{24}\ ions$

3.

Calculate the number of particles in

0.5 mol of lead(II) ions,

Pb^{2+}

.

\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]

a)

$0.5\times10^{23\ }atoms$

b)

$3\times10^{23}\ atoms$

c)

$0.5\times10^{23\ }ions$

d)

$3\times10^{23}\ ions$

4.

Calculate the number of atoms in

2 mol of ammonia,

NH_3

.

\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]

a)

$48\times10^{23\ }atoms$

b)

$12\times10^{23}\ atoms$

c)

$4.8\times10^{24\ }atoms$

d)

$1.2\times10^{24}\ atoms$

5.

Calculate the number of atoms in

1 mol of aluminium, Al

\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]

a)

$6\times10^{23\ }atoms$

b)

$12\times10^{23}\ atoms$

c)

$6\times10^{24\ }atoms$

d)

$1.2\times10^{24}\ atoms$

6.

Calculate the number of atoms in

32 g oxygen atom, O.
[RAM: O = 16]

a)

512 mol

b)

32 mol

c)

16 mol

d)

2 mol

7.

Calculate the number of atoms in

16 g oxygen gas,

O_2

.
[RAM: O = 16]

a)

0.5 mol

b)

2 mol

c)

16 mol

d)

32 mol

8.

Calculate the mass in

0.3 mol chlorine atom, Cl.
[RAM: Cl = 35.5]

a)

118.33 g

b)

35.80 g

c)

35.50 g

d)

10.65 g

9.

Calculate the mass in

3.2 mol ammonia gas,

NH_3

.
[RAM: N = 14, H = 1]

a)

17.2 g

b)

23.4 g

c)

48.0 g

d)

54.4 g

10.

Calculate the number of moles of $448cm^3$ of nitrogen gas, $N_2$ at STP.

\left[Molar\ volume:\ 22.4dm^3mol^{-1}at\ STP\right]

a)

0.01 mol

b)

0.02 mol

c)

0.03 mol

d)

0.04 mol

11.

Calculate the number of moles of $0.72dm^3$ of ammonia gas, $NH_3$ at room conditions.

\left[Molar\ volume:\ 24dm^3mol^{-1}at\ room\ conditions\right]

a)

0.01 mol

b)

0.02 mol

c)

0.03 mol

d)

0.04 mol

12.

Calculate the volume occupied by 0.125 mol of sulphur dioxide gas, $SO_2$ at STP.

\left[Molar\ volume:\ 22.4dm^3mol^{-1}at\ STP\right]

a)

$1.4dm^3$

b)

$2.8dm^3$

c)

$12.4dm^3$

d)

$22.4dm^3$

13.

Calculate the number of particles in 372.6 g lead, Pb.

\left[RAM:Pb=207;\ N_A=6\times10^{23}mol^{-1}\right]

a)

$1.8\times10^{24\ }atoms$

b)

$1.08\times10^{24\ }atoms$

c)

$18\times10^{23\ }atoms$

d)

$1.8\times10^{23\ }atoms$

14.

Calculate the number of particles in $6dm^3$ of ethane, $C_2H_6$ at $25^{\degree}C$

\left[1\ mol\ gas\ occupies\ 24\ dm^3\ at\ room\ condtions;\ N_A=6\times10^{23}mol^{-1}\right]

a)

$1.5\times10^{23\ }ions$

b)

$1.5\times10^{23\ }molecules$

c)

$1.5\times10^{24}ions$

d)

$1.5\times10^{24\ }molecules$

15.

Calculate the mass in $1.56\times10^{23}atoms$ of silver, Ag

\left[RAM:Ag=109;\ N_A=6\times10^{23}mol^{-1}\right]

a)

$0.26\ g$

b)

$0.26\ mol$

c)

$28.08\ g$

d)

$28.08\ mol$

16.

Calculate the mass in $1.2\times10^{22}\ molecules$ of nitrogen dioxide, $NO_2$ .

\left[RAM:N=14;\ O=16;\ N_A=6\times10^{23}mol^{-1}\right]

a)

$0.92\ mol$

b)

$9.2\ mol$

c)

$9.2\ g$

d)

$0.92\ g$

17.

Calculate the volume occupies in 2.8g carbon monoxide, CO at STP

\left[RAM:C=12;\ O=16;\ 1\ mol\ gas\ occupies\ 22.4dm^3at\ STP\right]

a)

$2.24\ dm^3$

b)

$22.4g$

c)

$2.24g$

d)

$2.24\ cm^3$

18.

Calculate the number of atoms in $1.2\ dm^3$ of methane, $CH_4$ at room conditions.

\left[N_A=6\times10^{23}mol^{-1};\ 1\ mol\ gas\ occupies\ 24dm^3at\ room\ conditions\right]

a)

$1.5\times10^{24}\ atoms$

b)

$15\times10^{23}\ atoms$

c)

$1.5\times10^{23\ }atoms$

d)

$15\times10^{24}\ atoms$

19.

Calculate the number of atoms in 1.2g of magnesium, Mg.

\left[RAM:\ Mg=24;\ N_A=6\times10^{23}mol^{-1}\right]

a)

$3\times10^{22}\ atoms$

b)

$3\times10^{23}\ atoms$

c)

$3\times10^{24\ }atoms$

d)

$3\times10^{25}\ atoms$

20.

Which of the following is the formula of phosphate ion?

a)

$OH^-$

b)

$SO_4^{2-}$

c)

$NO_3^-$

d)

$PO_4^{3-}$

3.2 Mole concept

Total questions: 20

Worksheet time: 13mins

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