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# Determine the ratios of the masses of nitrogen

This is problem # 1:
0.655g of antacid is weighed and mixed with 50.0 mL of excess 0.100 M HCl. The excess acid required 3.90 mL of 0.100 M NaOH for back titration. Calculate the neutralizing power of the antacid in terms of mmol H+ per gram of antacid.

This is problem # 2:
The amount of ozone in the atmosphere is influenced by concentrations of gases that contain only nitrogen and oxygen, among others. The table gives the masses of nitrogen that combine with 1.00g of oxygen to form three of these compounds.
Compound A: Mass of Nitrogen= 0.875
Compound B: Mass of Nitrogen= 0.438
Compound C: Mass of Nitrogen= 0.350

Determine the ratios of the masses of nitrogen that combine with 1.00 of oxygen in these compounds. Are these data consistent with the law of multiple proportions?

#### Solution Preview

1. Sol: Total number of moles of HCl = 0.1*50 = 5 mmol
Total number of moles of NaOH = 3.90*0.1 = 0.39 mmol
0.39 mmol of NaOH would neutralize 5 mmol of HCl.
Therefore, mmol of HCl ...

#### Solution Summary

The solution determines the rations of masses of nitrogen gases as they are added to other compounds.

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