Calculate the volume that will take 2.8 kg of nitrogen. Calculate the number of molecules of this gas containing in this volume.

2.8 kg = 2800 g;

Let’s calculate the molar mass of a simple substance nitrogen (N2):

M (N2) = 2 * A (N) = 2 * 14 = 28 g / mol;

Let’s find the amount of nitrogen substance:

n (N2) = m (N2) / M (N2) = 2800/28 = 100 mol;

Find the volume of nitrogen:

V (N2) = n (N2) * VM = 100 * 22.4 = 2240 l;

Let’s find the number of molecules in a given volume of nitrogen:

N (N2) = n (N2) * NA = 100 * 6.02 * 10 ^ 23 = 6.02 * 10 ^ 25.

Answer: V (N2) = 2240 l; N (N2) = 6.02 * 10 ^ 25.