Can someone please help me with these Chemistry problems?

grprettyangel · #1 (**permalink**) 03-13-2008, 09:17 PM

Find the mass percent for the following:
1.) What mass of each solute is present in 285g of a solution that contains 5.00% by mass NaCl and 7.50% by mass Na2CO3?
2.) A hexane solution contains as impurities 5.2%(by mass) heptane and 2.9%(by mass) pentane. Calculate the mass of each component present in 93g of the solution.
Please don't give the answers! Set the problem up please so I'll know how to solve it.

Brennan H · #2 (**permalink**) 03-13-2008, 09:18 PM

1) 285 x .05 = 14.5g of NaCl
285 x .075= 21.375g of Na2CO3
2) 93 x .052= 4.836g for hexane
93 x .029= 2.967g for heptane

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