Amixture was found to contain 1.50g of nh4cl, 0.80 g of nacl, and 1.20 g of sio2. what is the percentage of sand in this mixture?

Percent in mass is the amount of a component per mass of the mixture. From the given components, SiO2 represents the sand. Therefore, the percentage of sand in the mixture is:

Percent sand = 1.20 g / (1.20 g + 1.50 g + 0.80 g) x 100%= 34.29% sand

30litre of li2o is 1.0002mole approximately 1 mole

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