The mass of one molecule of water is approximately(1) 3 x 10^{-23} g(3) 1.5 x 10^{-23} g(2) 18 g(4) 4.5 x 10-23^{

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The gram molecular mass of water is 18 g. The number of water molecules present in 60 g of water is:

m L

D e n s i t y o f w a t e r i s 1.0 g m L^{- 1}; A v o g a d r o^{'} s n u m b e r = 6.023 \times 10^{23}

The number of molecules present in $4.25 g r a m s$ of $N H_{3}$ is approximately:

The number of molecules in 4.25 g of ammonia is approximately

THe number of molecules in 4.25 g of ammonia is:
(a) $1.0 \times 10^{23}$ (b) $1.5 \times 10^{23}$
(c) $2.0 \times 10^{23}$ (d) $3.5 \times 10^{23}$

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