Answer:
of acetic anhydride is needed
Explanation:
According to balanced equation, 1 mol of salicylic acid completely reacts with 1 mol of acetic anhydride
Number of moles = (mass)/(molar mass)
Molar mass of acetic anhydride = 102.09 g/mol
Molar mass of salicylic acid = 138.121 g/mol
So,
of salicylic acid =
of salicylic acid
Hence,
of salicylic acid reacts completely with
of acetic anhydride.
So, mass of acetic anhydride needed =
= 
3 bc Hf is an element hafnium and HF is compound hydrogen flouride
Answer:
3.2L
Explanation:
PV=nRT
since pressure and temperature are held constant we have V=nR
R is a constant also,
Thus; 
v1=1.5L , n1=3mol, n2=1.4mol

v2=
v2=3.2L
Nitrogen in an inert gas and most abundant in the nitrogen, it balances the proportion to other gases, and keep the atmosphere less dense
Hope this helps!