Question

How many molecules does 36.0 grams of water represent

How many moles does 80.0 grams of H2O represent

How many moles does 45.0 grams of C6H12O6 represent

How many moles does 22.0 grams of CO2 represent

How many moles does 56.0 grams of N2 represent

Answer 1

Answer on Question #50342, Chemistry, Other

How many molecules does 36.0 grams of water represent?

How many moles does 80.0 grams of $\mathrm{H}_2\mathrm{O}$ represent?

How many moles does 45.0 grams of $\mathrm{C_6H_{12}O_6}$ represent?

How many moles does 22.0 grams of $\mathrm{CO}_{2}$ represent?

How many moles does 56.0 grams of $\mathrm{N}_2$ represent?

Solution:

$$n = \frac {m}{M _ {r}} = \frac {N}{N _ {r}}$$

$\mathrm{M_r(H_2O) = 18\ g/mol}$

$\mathrm{M_r(C_6H_{12}O_6) = 180\ g/mol}$

$\mathrm{M_r(CO_2) = 44\ g/mol}$

$\mathrm{M_r(N_2) = 28\ g/mol}$

$\mathrm{N_a = 6.02 \times 10^{23}}$

36.0 g of water represents:

$$N = \frac {m \times N _ {r}}{M _ {r}} = \frac {36\ g \times 6.02 \times 10^{23}\ 1\ /mol}{18\ g/mol} = 12.04 \times 10^{23}$$

Answer 1:

12.04 × 10²³ particles

80.0 grams of $\mathrm{H}_2\mathrm{O}$ represents:

$$n = \frac {m}{M _ {r}} = \frac {80\ g}{18\ g/mol} = 4.44\ mol$$

Answer 2:

4.44 moles

45.0 grams of $\mathrm{C_6H_{12}O_6}$ represents:

$$n = \frac {m}{M _ {r}} = \frac {45\ g}{180\ g/mol} = 0.25\ mol$$

Answer 3:

0.25 moles

22.0 grams of $\mathrm{CO}_{2}$ represents:

$$n = \frac {m}{M _ {r}} = \frac {22\ g}{44\ g/mol} = 0.5\ mol$$

Answer 4:

0.5 moles

56.0 grams of $\mathrm{N}_2$ represents:

$$n = \frac {m}{M _ {r}} = \frac {56\ g}{28\ g/mol} = 2\ mol$$

Answer 5:

2 moles

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