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Question

# Number of electrons in 1.8 mL of H2O are:

A
6.02×1023
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B
3.01×1024
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C
1.8×1023
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D
6.02×1025
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Solution

## The correct option is B 6.02×1023There is a total of 10 electrons in 1 H2O Molecule (2 electrons from hydrogen and 8 electrons from oxygen.)moles of H2O(n)=massofsubstancemotormass18 g of H2O = 1 mole mass of 1.8 ml of H2O=1.8 ml×1 g/ml=1.8 g [∵Density of H2O=1 g/ml]1.8 g of water = 0.1 moles of waterTherefore, 1.8 ml of H2O means 0.1 mole of H2ONumber of molecules = n× Avogadro NumberNumber of molecules = 0.1×6.022×1023=0.6022×1023Number of electron in total molecules of H2O =0.6022×1023×10Number of electron in total molecules of H2O =6.022×1023Option A is correct.

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