Question

what is the mass in grams of 5.40 moles of lithium.

Answer 1

You would use the formula:

n = $\frac{m}{M}$

Where m is the mass, and M is molar mass (the periodic table would be used for this)

In this case, we need to rearrange the formula to find m

m = nM
    = 5.40 x 6.941
    = 37.5g

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Answer 2

To calculate the mass of the element Lithium this formula is used:

n = m/M

Where m is the mass, n is the number of mole and M is molar mass of the element Lithium

In this scenario, it can be rearranged to find m which is

m = nM

   = 5.40 x 6.941

   = 37.5g

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