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Empirical Formulas

Authored by Teresa Justice

Chemistry

10th Grade

Used 4+ times

Empirical Formulas
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6 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

NO
N2O3
N2O4
N2O5

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An empirical formula:

is a formula that calculates the coefficients of a compound in a balanced equation.

is the simplest whole-number ratio of moles of elements in the compound.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What do you do when you do not get whole numbers in the ratio?

add 2 to each element

add two to only the one with the half

multiply the one with the half only by two

multiply all of them by two

add two to all of the ratios

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

SO
SO2
SO3
SO4

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Cu3O8
CuO4
Cu2O
Cu4O10

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the empirical formula of the following molecular formula:  C3H6

C3H6
CH2
C2H4
CH3

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