Question

13. A solution is prepared by dissolving 45g
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Answer 1

Answer:

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of A}=\frac{\text{Mass of A}}{\text{mass of A +mass of B}}\times 100Mass percent of A=

mass of A +mass of B

Mass of A

×100

To find mass percent of water

\text{Mass percent of water}=\frac{\text{Mass of water}}{\text{mass of water +mass of sugar}}\times 100Mass percent of water=

mass of water +mass of sugar

Mass of water

×100

Mass of sugar= 45 g

Mass of water = 180 g

Putting in the values we get:

\text{Mass percent of water}=\frac{180g}{180g+45g}\times 100=80\%Mass percent of water=

180g+45g

180g

×100=80%