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A sample of river wayer contains 125mg per dm^3 of dissolved soilds. Calculate the mass of dissolved soilds in grams in 250 cm^3 of this sample of river water. Giver your answer to 2 significant figures (4 marks)

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A sample of river wayer contains 125mg per dm3 of dissolved soilds Calculate the mass of dissolved soilds in grams in 250 cm3 of this sample of river water Give class=

Respuesta :

Cm3 into dm3 = 250/1000= 0.25dm3

Answer is in g convert mg into g = 125/1000= 0.125g

This means there is 0.125g of solids in 0.25dm3

Need to know how much is in 1dm3

0.25dm3 is 1/4 of 1dm3

0.125/4 = 0.03125

0.031g (2S.F)

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