If a food has 12 g of carbohydrate, 25 g of fat, and 15 g of protein, how many calories does it have in total?

What is the chemical formula of the following compound

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.