How much fluorine (in grams) does the second sample produce? i divided 2.58kg of fluorine by the 1.24kg of magnesium, but i'm not sure that's the right way to do this. should i cross multiply? i read the page in the book, and it had nothing to do with a problem like this.

1.94 kg

Explanation: Given :

Sample 1 produces 1.65 kg of Mg and 2.58 kg of .

As every chemical reaction follows law of conservation of mass, which says that the mass of products must be equal to the mass of reactants.

Thus mass of should be 1.65+2.58 kg = 4.23 kg

1.65 kg of Mg was produced by 4.23 kg of

Now the second sample produces 1.24 kg of Mg.

1.24 kg of Mg will be produced by=

Now again law of conservation of mass is to be followed so mass of will be= mass of - mass of

=(3.18 kg -1.24 kg)  = 1.94 kg

answerlinnaeus;

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.