Question

* The number of significant figures in the numbers 672.9 and 2,620 X 10^7 are:​

Answer 1

4 is the correct answer.

thank you

Answer 2

answer

20 mol

Explanation:

H2O is 18g

Given 36g

So,number of moles=given weight /gram molecular weight

So number of moles=36/18=2

1 mole of H2O has 10 mol of electrons

3 moles of H2O will have 20 mol of electrons

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