Free Printable Fourth Form Moles

Worksheets

Fourth Form Moles

Total questions: 20

Worksheet time: 28mins

Name

Class

Date

What is the relative formula mass of CO (carbon monoxide)?

(A_r: C = 12, O = 16)

How many iron, nitrogen and oxygen atoms are there in Fe(NO₃)₃?

3 iron atoms, 3 nitrogen atoms and 6 oxygen atoms

3 iron atoms, 3 nitrogen atoms and 9 oxygen atoms

1 iron atom, 1 nitrogen atom and 3 oxygen atoms

1 iron atom, 3 nitrogen atoms and 9 oxygen atoms

What is the relative formula mass of Fe(NO₃)₃?

(A_r: Fe = 56, N = 14, O = 16)

118

214

242

Calculate the mass of 0.25 mol of carbon dioxide molecules.

(M_r: CO₂ = 44)

(Higher Tier Question)

33 g

11 g

12 g

16 g

Calculate the number of moles of water molecules in 36 g of water.

(M_r: H₂O = 18)

(Higher Tier Question)

2 mol

0.5 mol

18 mol

16 mol

Why is there a decrease in mass when this reaction happens?: CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂

Carbon dioxide gas is released.

Water is made.

Chemicals are used up.

New chemicals are made.

A reaction happens.

What is the relationship between moles, relative formula mass and mass? Choose all correct answers.

mass= moles / RAM

mass x moles = RAM

moles = RAM x mass

mass= RAM /moles

mass= RAM x moles

How many moles are in 19.5 g of NaCl? (RAM Na=23, Cl=35.5)

0.33 mol

22267 mol

3.00 mol

How many atoms are in 9.44 moles of Al?

5.68 atomsAl

5.68x10²⁴atoms Al

0.705 atoms Al

1.25x10²³atoms Al

10.

How many molecules are in 9.44 moles of AlCl₃?

5.68 molec AlCl₃

5.68x10²⁴molec AlCl₃

0.705 molec AlCl₃

1.25x10²³molec AlCl₃

11.

How many molecules are there in 31.8 moles of water?

5.28 x 10^-23 molecules

1.91 x 10²⁵ molecules

12.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

13.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO2

SO3

SO4

14.

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

15.

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

C₂H₃O₂

CH₂O

C₂H₄O₂

C₃H₈O₃

16.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

NaPO2

Na2PO3

Na3PO4

NaPO4

17.

Which one is the empirical formula?

C₄H₆

CH₃

C₂H₃

C₄H₆

18.

Molarity of 0.1 moles Na₂CO₃ in 50 mL solution is

2 M

0.002 M

0.2 M

19.

What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per

500 mL?

0.2

20.

What is the mass percent of carbon in carbon dioxide?

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Fourth Form Moles

Total questions: 20

Worksheet time: 28mins

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