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Calculate the mass of:--
(i) 3.011x 10 32 atoms of O. (ii) 6.022 x10 23 molecules of O2.
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In an aquarium,the number of star fish to the number of gold fish was 1.5:2.5.The rewere 30 gold fish.Aftersome of the star fish died,the ratio became 0.5:1.5. How many star fish died?
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