11wk Flashcard Chem

Front

What conversion would you use to get ATOMS from moles?

Back

Multiply by 6.02 x 10^23.

Front

What is the molar mass for HgCl2?

Back

271 g/mole.

Front

What conversion would you use to go from grams to moles?

Back

1 mole / Molar mass.

Front

How many MOLES are in 52.2 grams of Silver, Ag?

Back

0.483 moles Ag.

Front

In the reaction 4Al + 3O2 --> 2Al2O3, how many MOLES of O2 are needed for 1.5 moles of Al?

Back

1.13 moles O2.

Front

What is the definition of molar mass?

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is Avogadro's number?

Back

6.02 x 10^23, the number of atoms or molecules in one mole of a substance.

Front

How do you calculate the number of moles from grams?

Back

Divide the mass of the substance (in grams) by its molar mass (g/mol).

Front

What is the mole ratio in a chemical reaction?

Back

The ratio of moles of one substance to moles of another substance in a balanced chemical equation.

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

They indicate the relative number of moles of each reactant and product involved in the reaction.