Question

The approximate recommended daily dietary intake of the amino acid valine, c5h11no2, is 2.60 g for a 100 kg adult. what is this requirement in moles?

Answer 1

Answer is: requirement of valine is 0,0222 mol for a100 kilograms adult.
m(C₅H₁₁NO₂) = 2,60 g.
M(C₅H₁₁NO₂) = 5 · 12 + 11 · 1 + 1 · 14 + 2 · 16 · g/mol.
M(C₅H₁₁NO₂) = 117 g/mol.
n(C₅H₁₁NO₂) = m(C₅H₁₁NO₂) ÷ M(C₅H₁₁NO₂).
n(C₅H₁₁NO₂) = 2,60 g ÷ 117 g/mol.
n(C₅H₁₁NO₂) = 0,0222 mol.
n - amount of substance.
m - mass of substance.
M - molar mass of substance.

Answer 2

To calculate the requirement in mole, we need to calculate the molar mass.  
C5H11NO2 = (12 * 5) + (1 * 11) + 14 + (16 *2) = 117
 Hence number of moles = mass/molar mass
 Mass = 2.6g and molar mass = 117
 Number of moles = 2.6/117 = 0.022