You can put this solution on YOUR website! How many milliliters of 70% alcohol can be made from 500 ml of 91% alcohol?
How much water will be needed for the previous problem?
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water + water = water
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0.09*500 + x = 0.30(500+x)
9*500 + 100x = 30*500 + 30x
70x = 21*500
x = 3*50
x = 150 ml of water (amt. of water needed)
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cheers,
Stan H.
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