Question

what is the molarity of 5.30g of Na2CO3 dissolved in 400.0 mL solution?

Answer 1

moles(Na2CO3) = 5.3/106 = 0.05 
molarity = moles/ volume 
= 0.05/0.4 
= 0.125 mol/ dm3
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Answer 2

The molarity of Na2CO3  is mathematically given as

M= 0.125 mol/ dm3

What is the molarity of Na2CO3?

Question Parameters:

Generally, the Moles of (Na2CO3)   is mathematically given as

Moles(Na2CO3) = 5.3/106

Moles(Na2CO3) = 0.05

Hence

molarity = moles/ volume

Therefore

M=0.05/0.4

M= 0.125 mol/ dm3

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