Question

calculate total number of neutrons present in 4 gram of water ​

Answer 1

HEY MATE !!!

Each molecule of H2O contains two atoms of hydrogen (no neutrons) and one of oxygen (8 neutrons)

first we need to evaluate how many molecules of water are there in 4 grams of water.

We know that one mole of hydrogen atoms has a mass of 1 gram and 1 mole of Oxygen atom has a mass of 16 grams (atomic weight).

this tells us that one mole of water has mass of 18 grams (2 from hydrogen and 16 from oxygen)

thus 4 grams of water has 6 mole of it (18÷4).

a mole of things contains Avogadro's number of things about 6.0221×10^23 .Thus 6 mole of water contains

$6.0221 \times {10}^{23} \times 6 \\ = 36.1326 \times {10}^{23}$

moleculesmolecules of water with 8 neutrons a piece. Performing this multiplication we get about 216.7956 neutrons in 4 grams of water.

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