B. Study the given sample problem on how to get the percent by mass and percent by volume and solve practice problems 1 & 2

Practice Problem 1:
A Bicol Tablea is sold in a store. Its mass is 8 grams containing 5.2 grams cocoa powder. What is the percent by . mass of cocoa powder?

Practice Problem 2:
An alcohol is used as disinfectants. Its total volume is 100 ml containing 70 ml ethyl alcohol. What is the percentage by volume of ethyl alcohol?​