Exam 1.3

Question 1

Avogadors #

Answer 1

of atoms

6.02 x10x23

Question 3

2 moles of Hydrogen or 2 g Hydrogen
react with
•1 mole of Oxygen or 16 g Oxygen
and produce
•— mole of Water (H2O) or — g of H2O

Answer 3

1
18

Question 4

Percentage Composition

Answer 4

The mass percentage of each element in the compound.

Question 5

Empirical Formula

Answer 5

The formula of a substance written with the smallest integer subscripts.

Determining the empirical formula for a substance involves converting the masses of the elements to moles.

Question 6

Required to Determine Molecular Formula

Answer 6

% comp
Molecular weight

Question 7

Steps to solving a limiting-reactant problem

Answer 7

1.Identify the limiting reactant.
2.Calculate the amount of product from the amount of the limiting reactant.
3.The smallest amount is all that can be made

Question 8

How much product is synthesized in ideal conditions is called the

Answer 8

theoretical yield

Question 9

The amount of product actually produced by a reaction (i.e., in the lab) will usually be less than the theoretical yield and is referred to as the

Answer 9

actual yield

Question 10

percent yield formula

Answer 10

% of the chemical reaction=

(Actual yield/theritcal yield) x 100