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20 December, 07:12

Mgcl2 has a concentration of 0.054 M in the ocean. How many grams are present in 25ml of sea water

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  1. 20 December, 07:42
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    0.129g MgCl2

    Explanation:

    For this we need to understand the concept of molarity.

    Molarity is number of moles of solute/litres of solution

    M=n/L

    Here we are given molarity of 0.054M and volume of 25ml. we just plug this in formula to find moles of MgCl2

    0.054=x / (25/1000) (we divided 25 by 1000 to convert it to litres of solution)

    x=0.00135 moles of MgCl2 (we are not done yet the question asks for grams so to convert to grams we multiply by molar mass of MgCl2.)

    0.00135molesMgCl2 x 95.211g MgCl2/1molMgCl2

    = 0.129g MgCl2
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