The wax appears to disappear as a candle burns. How can the law of conservation of mass apply to this reaction?

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

Table sugar completely dissolved in water is an example of a?

Chemistry worksheet - i am not sure what they are asking for exactly?