A) 18 molecules of water
B) 1.8 g of water
C) 18 g of water
D) 18 moles of water
Correct Answer: D
Solution :
| Key concept Mole is the biggest unit to measure number of molecules/atoms/ions. |
| \[\because \] 1 mole of water contains molecules |
| \[=6.02\times {{10}^{23}}\] |
| \[\therefore \] 18 moles of water contain molecules |
| \[=18\times 6.02\times {{10}^{23}}\] molecules |
| Now, 1 mole of water = 18 g of water |
| Hence, number of molecules in 18 g of water |
| \[6.02\times {{10}^{23}}\] |
| and 1.8 g of water contains |
| \[=6.02\times {{10}^{22}}\] molecules |
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