2. Number U (2) 6 x 1023 (1) 6 X 10...
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2. Number U (2) 6 x 1023 (1) 6 X 1022 (4) 10 x 1023 (3) 8 x 1023 Weight of H,O, present is 17 gram then number of oxygen atom will be (1) 3 x 1022 (2) 6 x 1023 (3) 6 × 1024 (4) 6 x 1022 > If Nais Avogadro's number then number o electrons in 4.2 g of nitrogen atom (N) (2) 4.2 NA (4) 3.2 NA The total number of protons in 10 g of calciu carbonate is (N = 6.023 x 1023) (1) 1.5057 x 1024 (2) 2.0478 x 1024 . (1) 1.5 NA (3) 1.6 NA

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Chemistry
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no. g moces en ( 4.2 mathrm{g} ) ont ( N ) ( begin{aligned} &=frac{4 cdot 2}{14}=0.3 v 0.00 e^{0} &=14 times 0.3 times N_{A} &=4.2 mathrm{NA} end{aligned} ) (0) ( 4 n 8 )
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