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Answer 1

It's like this first you need to find the moles of PF3 gas present in the cyliner by using the below equation
n- m / M
n= moles
m= mass
M = molar mass
In every compound the no. of molecules in one mole is 6.022 * 10^23
So when you find the moles then to find the no. of molecules you need to multiply the no. of moles by 6.022 * 10^23