`NH_3`, gas at STP is kept in a cylinder of volume 5600mL.
a) How many moles of `NH_3`, is present in the cylinder?
b) Calculate the mass of gas in the cyclinder.
c) Find the number of molecules in the gas calculate the number of atoms in it. (Hint: Atomic mass, N=14, H-D)

Explanation

a) Volume = 5600ML =5.6L
No. of moles =`(volume in litres/22.4L)`
`(5.6L/22.4L)`=`(1/4) xx 17`
b) `mass = no. of moles xx GMM`
`(1/4) xx 17`
`c. No. of molecules = No. of moles xx N_A`
`(1/4) xx N_A` = `(1/4) xx 6.022 xx 10^23`
` No. of atoms = no. of molecules xx atomicity`
`(1/4) xx 6.022 xx 10^23 xx 4`
`6.022 xx 10^23`