Question

What is the mass in grams of 5.40 moles of lithium? what is the mass in grams of 5.40 moles of lithium? 37.5 1.29 6.94 3.25 × 1024 none of the above?

Answer 1

M(Li)=6.94 g/mol
n(Li)=5.50 mol

m(Li)=n(Li)M(Li)

m(Li)=5.40*6.94=37.476 g≈37.5

m(Li)=37.5 g

Answer 2

37.5 g

Step-by-step explanation:

First you should kwow the molar mass of the lithium, so you can use your periodic table.

Molar mass of lithium =
`6.941(g)/(mol)`

Then you should relate the molar mass of the lithium with the quantity of moles the problem gives you:

`5.40molesoflithium*(6.941goflithium)/(1moloflithium)=`37.48 g of lithium

Rounding the answer

37.5 g of lithium