Question

the chemical formula for lithium hydride is lih. a chemist measured the amount of lithium hydride produced during an experiment. she finds that 88.2 g of lithium hydride is produced. calculate the number of moles of lithium hydride produced. be sure your answer has the correct number of significant digits.

Explanation:

Step1: Find molar mass of LiH

The molar mass of Li (lithium) is approximately 6.94 g/mol and H (hydrogen) is approximately 1.01 g/mol. So, molar mass of LiH, $M = 6.94\ g/mol+ 1.01\ g/mol=7.95\ g/mol$.

Step2: Calculate number of moles

The formula for number of moles $n=\frac{m}{M}$, where $m = 88.2\ g$ (mass of LiH) and $M = 7.95\ g/mol$. So, $n=\frac{88.2\ g}{7.95\ g/mol}\approx11.1\ mol$.

Answer:

11.1 mol