Water percent

A 15 g sample of the substance contains 70% water. After drying, the substance reduced its weight to 9 g. What percentage of water is now in the sample?

Correct answer:

p =  50 %

Step-by-step explanation:

m1=15 g q=70%=10070=107=0.7 m2=9 g  v=q m1=107 15=107 15=10105=221=10.5 g s=m1v=15221=215 2221=230221=23021=29=4.5  p=100 m2m2s=100 9929=50%



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