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Determining the Empirical Formula of a Compound from its Percent Composition

FACTORYESCAPE GAME

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THE MISSION

Determine the empirical formula of a compound.

THE base

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It is the written representation of the chemical proportions of atoms that comprise a particular compound.

chemical formula

molar mass

QUESTION 1/5

This chemical formula shows the lowest whole-number ratio of elements that comprise a compound.

empirical formula

molecular formula

QUESTION 2/5

structural formula

It refers to the ratio of the mass of an element and the mass of the compound, multiplied by 100%.

molar mass

atomic weight

QUESTION 3/5

percent composition

It is the fundamental quantity that is used to describe the amount of elements in a compound.

atomic weight

mole

QUESTION 4/5

mass

It is another term that is used to describe the empirical formula.

common formula

simplest formula

QUESTION 5/5

THE base

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True

False

The molecular formula is also known as the simplest chemical formula.

QUESTION 1/3

True

False

The percent composition of the compound may be used to determine its empirical formula.

QUESTION 2/3

True

False

The empirical formula of the compound also tells the actual number of atoms present in it.

QUESTION 3/3

the base

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Cl2O

Cl2O7

ClO

What is the empirical formula for a compound that contains0.063 mol chlorineand 0.22 mol oxygen?

QUESTION 1/3

NO

N5O2

N2O5

A compound contains 1.85 mol N and 4.63 mol O. What is the empirical formula?

QUESTION 2/3

CH2

C3H8

C3H2

Calculate the empirical formula of a compound containing6.80 mol C and 18.11 mol H.

QUESTION 3/3

the base

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NO

N2O

N4O10

N2O5

What is the empirical formula of a compound if a sample contains 0.130 g of nitrogen and 0.358 g of oxygen?

QUESTION 1/3

NiO

Ni3O2

NiO2

Ni2O3

In the laboratory, a sample is found to contain 1.05 grams of nickel and 0.29 grams oxygen. Determine the empirical formula.

QUESTION 2/3

FeO3

Fe2O3

FeO

Fe3O5

A sample of the black mineral hematite, an oxide of iron found in many iron ores, contains 34.97 g of iron and 15.03 g of oxygen. What is the empirical formula of hematite?

QUESTION 3/3

the base

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CH2O2

CHO

C3H2O2

CHO2

What is the empirical formula for a compound that contains 26.1% carbon, 4.3% hydrogen and 69.6 % oxygen?

QUESTION 1/3

NO

NO2

N2O3

NO3

An oxide of nitrogen contains 30.45% N and 69.55% O. What is its empirical formula?

QUESTION 2/3

C3O2

CO

CO2

C2O3

The bacterial fermentation of grain to produce ethanol forms a gas with a percent composition of 27.29% C and 72.71% O. What is the empirical formula for this gas?

QUESTION 3/3

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