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

there is none because earth is stationary and flat.

i wish i could but this one is weird give me abc and i can solve it.