How to Find a Mass of A Product

[Princess Jereza 3C]

Without giving out too much information, how does one find a mass of a product. So say that the molar mass is given for that product, and the molar masses of the reactants are given, what would the steps be in order to find a mass of a product. This may be too vague, but any help will do, thanks.

[Brooke Yasuda 2J]

You can use the law of conservation of mass which states that the mass of the products must equal the mass of the reactants. So, if you know the total mass of the reactants or even the moles of the reactants then you could figure out the mass of the products.

[Justin Vayakone 1C]

We can't find the mass of a product with only molar mass. We need to be given some more information, like moles of reactants or products for example. If moles of a product is given, we multiply that number by the molar mass of that product to find the mass in grams. If moles of reactants are given, we have to find the limiting reactant. Then convert the amount of that limiting reactant into the mass of the product through using molar masses of the reactants and products as well as molar ratios.

[Jesse H 2L]

law of conservation of mass

[Jessica Castellanos]

First thing you want to do is balance your reaction equation. When the problem gives you the mass of the reactants use the molar mass of the reactants to calculate the moles for each reactant to determine the limiting reactant. Use the amount of moles of the limiting reactant to calculate the moles of the product you are searching for through the ratio of moles that a balanced equation gives (the stoichiometric coefficients). After doing so, the new quantity of moles of the product can be converted back into grams (the mass) by simply multiplying the molar mass by the quantity of moles. I hope this helps!