Question

A student was asked to calculate the mass of ammonia,  , in a solution given that there are 54   molecules present. The student’s calculation is shown below. Find the error(s) in the conversion factors, explain what the student did wrong and then correct the calculation. (note: there are 6.02x10²³ molecules per mole)

Answer 1

$\frac{54}{6.02×10^{23}}=8.97×10^{-23}$

$Mass = 17.031 ×[8.97×10^{-23}]=1.53×10^{-21}$