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1. \(2.5\) \(moles\) of \(CO_2\) at STP
 
Data:
 
Given number of moles of \(CO_2=2.5\)
 
Molar volume of \(CO_2\) at STP \(=\)
 
Solution:
  
Volume of \(CO_2\) at STP \(=\)
 
Therefore, the volume occupied by \(2.5\) \(mole\) of \(CO_2\) at STP \(=\)
 
2. \(3.011\times10^{23}\) of ammonia gas molecules.

Data:
 
Given the number of ammonia gas molecules \(=\) \(3.011\times10^{23}\)
 
Avogadro’s number \(=6.023\times10^{23}\)
 
Solution:
 
Number of moles \(=\)
 
\(=\)
 
Volume occupied by \(NH_3\) \(=\)
Therefore, the volume occupied by \(3.011\times10^{23}\) of ammonia gas molecules \(=\)
 
3. \(14\) \(g\) of nitrogen gas.
 
Data:
 
Given mass of nitrogen gas \(=14\) \(g\)
 
Molecular mass of nitrogen gas \(=28\)
 
Solution:
 
Number of moles \(=\)
 
\(=\)
 
Volume occupied by \(N_2\) gas at STP \(=\)
Therefore, the volume occupied by \(14\) \(g\) of nitrogen gas \(=\)