1)solve this ,8.0g of magnesium oxide on reduction in a stream of hydrogen gave 4.8g of magnesium. calculate the number of moles of magnesium oxide;the number of moles of oxygen in the oxide (Mg= 24; 0 =16).

The answer is 323 g.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

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