Automobile air bags use the decomposition of sodium azide as their sources of gas for rapid inflation, represented in the reaction below. what mass (in grams) of nan3 is required to provide 40.0 l of n2 at 25°c and 763 torr?

Answer : The mass of required is 71.175 grams.

Explanation :

To calculate the moles of nitrogen gas, we use the equation given by ideal gas :

PV = nRT

where,

P = Pressure of nitrogen gas = 763 torr

V = Volume of the nitrogen gas = 40.0 L

n = number of moles of gas = ?

R = Gas constant =

T = Temperature of helium gas =

Putting values in above equation, we get:

Now we have to calculate the moles of .

The balanced chemical reaction is:

From the balanced chemical reaction, we conclude that

As, 3 moles of produced from 2 moles

So, 1.642 moles of produced from moles

Now we have to calculate the mass of .

Molar mass of = 65 g/mol

Therefore, the mass of required is 71.175 grams.

d) the number of neutrons plus the number of protons

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