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As a clinical chemist in charge of the testing of blood samples. You are required to mix a solution of sodium chloride with water in the ratio of 2:5.
=2:5
2/7 of whole solution chloride
5/7 of whole solution is water
780ml = 2/7
1/7 = 390 ml
5/7 = 1950
Total solution
=2730ml
780ml = sodium chloride
1950ml = water
780:1950ml.
How do I put that in standard form and to an appropriate number of significant figures?