Compound Stoichiometry

Question 1

Dalton’s first mass law

Answer 1

Matter is not created or destroyed

Question 2

Dalton’s 2nd mass law

Answer 2

The atoms in compounds are always found in fixed ratios

Question 3

Who came up with the 4 postulates

Answer 3

John Dalton

Question 4

Express the lowest charge balanced ratio

Answer 4

Ionic formula units

Question 5

Standard unit of mass on the atomic/molecular level is defined using the _______ isotope

Answer 5

Carbon-12

Question 6

1 amu =

Answer 6

1.6606 x10^-24 g

Question 7

Number of protons + neutrons

Answer 7

Mass number

Question 8

Mass of one isotope of an element

Answer 8

Isotope mass

Question 9

Weighted average of isotope masses

Answer 9

Atomic mass

Question 10

Mass of 1 mole of the substance

Answer 10

Molar mass

Question 11

1 mole is what number

Answer 11

6.022 x 10^23

Question 12

% composition =

Answer 12

(Mass of element/mass of compound) x 100

Question 13

The percent composition of all the elements present in a compound must add up to

Answer 13

100%

Question 14

Lowest mathematical ratio of elements

Answer 14

Empirical formulas

Question 15

Actual ratio of elements

Answer 15

Molecular formula

Question 16

What is the empirical formula of C2H4O2?

Answer 16

CH2O