Question

1. The concentration of sodium chloride, NaCl, in normal blood plasma is about 1.3 mol/L. A certain adult has 3.1L of blood plasma in her body. (6 marks)
2. What amount (in mol) of NaCl is contained in that volume? 
3. What mass of NaCl is contained in that volume?

Answer 1

n (NaCl) = 1.3 x 3.1 = 4.03 mol

n = m / M

m = M x n

M (NaCl) = 58.44 g/mol

m (NaCl) = 58.44 x 4.03 = 235.5 g