Rachel and Billy are conducting an experiment. The mass of their candle before burning was 7.0 grams. After burning the candle for six minutes, the mass went down to 5.5 grams. What can the students determine about the results of their experiment? A. The law of conservation of mass cannot be applied over short periods of time. B. The law of conservation of mass does not apply to chemical changes like burning. C. The law of conservation of mass was broken because the mass of the candle decreased. D. The law of conservation of mass was not broken because the missing mass was released as smoke

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

the answer is 0.42 is that is an option. this question provides no info

no starving yourself won't it will make you lose more weight what you need to do is find out what foods make you gain weight like bread and meats with fat on