Start with 0.98g of NaOH how many moles of NaOH did we start with?

Question

Mathematics

Reese Johns

10 September, 22:27

Start with 0.98g of NaOH how many moles of NaOH did we start with?

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Answers (1)

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Rigoberto Everett · Answer 1

The answer is 0.0245 moles

(1) Find the molar mass of NaOH (it is the sum of atomic masses of its elements):

Mr (NaOH) = Ar (Na) + Ar (O) + Ar (H) = 23 + 16 + 1 = 40 g/mol

So 1 M of NaOH has 40g

(2) Find the number of moles of 0.98g:

1 M has 40g.

x M has 0.98 g.

1M : 40 g = x : 0.98 g

x = 1M * 0.98 g : 40 g = 0.0245M