Question

Sample of ammonia weighs 300 g. what mass of sulphur trioxide contains the same number of molecules as are in 300 g ammonia?

Answer 1

Answer:

Answer: 7.52 g of sulfur dioxide contains the same number of molecules as are in 2.00 g ammonia

Explanation:

Mass of the ammonia = 2.00 g

Moles of ammonia=\frac{\text{Given mass}}{\text{molar mass}=\frac{2.00 g}{17 g/mol}=0.1176 moles Number ammonia molecules = [tex]\text{Number of moles}\times N_A=0.1176\times 6.022\times 10^{23}=7.08\times 10^{22} molecules

For same number molecule for SO_2SO

2

Number SO_2SO

2

molecules = \text{Number of moles of }SO_2\times N_A=0.117\times 6.022\times 10^{23}Number of moles of SO

2

×N

A

=0.117×6.022×10

23

\text{Number of moles of }SO_2=\frac{7.08\times 10^{22} molecules}{6.022\times 10^{23}}=0.1175 molesNumber of moles of SO

2

=

6.022×10

23

7.08×10

22

molecules

=0.1175moles

Mass of SO_2=0.1175 moles\times 64g/mol=7.52 gSO

2

=0.1175moles×64g/mol=7.52g

7.52 g of sulfur dioxide contains the same number of molecules as are in 2.00 g ammonia

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