A substance is 99% water. Some water evaporates, leaving a substance that is 98% water. How much of the water has evaporated?

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Jaydan Gilbert · Accepted Answer

you know that 99% of the solution was water, and 1% was somethingelse.the water evaporates, but the 1% that was something else does notchange.after the water evaporates, you have 98% water, so 2% somethingelse.lets call something else (S) and water (W)first we haveW = 99%S = 1%and after evaporation we haveW= 98%S= 2%only the amount of water changed, the amount of S did not, sincethe percentage of S was doubled, the amount of water was divided by2.99 / 2 = 49.5so you have 49.5% of the water still in the solution, which means50.5 percent was evaporated.this of it this way, if you have 200 people in a room and 198people were male and 2 people were female, then 99% of the room wasmale and 1% of the room was female.how many men would have to leave the room to make it 2% women,while still only having 2 people in the room? since the percent ofwomen doubled, we divide the percent of men by 2.99/2 = 49.549.5% of 198 men is 98 men, which makes 98 men and 2 women, meaningthe women are now 2% of the people in the room.

Rose Graves · Accepted Answer

Think of it in terms of 100g99g water1g undesignated substancewe want to find 2/100 which is 1/50so 50/99% of the water is evaporatedthis leaves 1/50 or 2%

A substance is 99% water. Some water evaporates, leaving a substance that is 98% water. How much of the water has evaporated?

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