What is the mass of nitric acid contained in a solution with a volume of 0.4 liters. at с (HNO3) = 0.1 mol / l?

(HNO3) = 0.1 mol / L is the molar volume, 0.4 L is the simple volume.
You need to find a lot.
1) remember the formula: Vm = V / n
To find the mass we need to find the number of particles, that is, – n
n is found based on the above formula: n = V / Vm
That’s all, we divide: n = 0.4: 0.1 = 4 mol
2) Well, now, in fact, we find the mass itself, but for this we need to find the molar mass, which is equal to the molecular mass:
Mr = M
Mr = 1 + 14 + 16 * 3 = 15 + 48 = 63 g / mol – molar mass
Its formula = M = m / n
from here we take out the mass we need
m = n * M
m = 4 * 63 = 252 grams
Answer: the mass of nitric acid is 252 grams.