Free Printable Mole and Quantitative Chemistry

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Mole and Quantitative Chemistry

Total questions: 25

Worksheet time: 49mins

Name

Class

Date

In the following equation, what is the molar ratio between hydrochloric acid and copper(II) oxide?

2 HCl + CuO → CuCl₂ + H₂O

1 : 2

2 : 1

1 : 1

In an experiment, the actual yield is 8.4 g but the theoretical yield is 17.0 g. what is the percentage yield?

24.7 %

50.6 %

49.4 %

When the equation below is balanced, what is the coefficient for oxygen?

__C₂H₂(g) + __O₂(g) → __ CO₂(g) + __ H₂O(g)

Ethyne, C₂H₂, reacts with oxygen according to the equation below. What volume of oxygen (in dm³) reacts with 0.40 dm³ of C₂H₂? (STP)

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)

0.40

0.80

1.0

2.0

How many oxygen atoms are present in 0.0500 mol carbon dioxide?

3.01×10²²

6.02×10²²

6.02×10²³

1.20×10²⁴

What mass (g) of potassium hydroxide (KOH) is needed to make up 500 cm³ of a solution of concentration 0.2 mol.dm^-3?

2.8

11.2

5.6

0.56

What mass of CO₂ will be produced when 50 g of CaCO₃ decomposes?

CaCO₃ → CO₂ + CaO

22 g

44 g

11 g

33 g

What is the percentage by mass of carbon in calcium carbonate CaCO₃?

What is the mass of one mole of (NH₄)₂CO₃?

144g

138g

96g

74g

10.

4.0 moles of H₂O would have what mass?

72 g

23 g

68 g

4.5 g

11.

Calculate the number of gold atoms in a 4 mole sample of gold.

2.41x10²⁴

3.01x10²³

4.82x10²⁴

6.02x10²³

12.

Calculate the % composition by mass of oxygen present in H₂SO₄.

16.3%

65.25%

32.6%

57.14%

13.

A 154 g sample of a compound contains 15.01 g of C and 62.03 g of Cl. What is the empirical formula for this compound.

CCl₃

C₄Cl

CCl₄

CCl

14.

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

N₂O₄

N₂O₃

N₂O₅

15.

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

16.

Tartrazine is a common food colour used to enhanced the appearance of the food. Its chemical formula is C₁₆H₉N₄Na₃O₉S₂. Calculate its formula mass.

(include the correct unit)

(a)

17.

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

AlCl3

Cl2

18.

3NH₄NO₃ + Na₃PO₄ --> (NH₄)₃PO₄ + 3 NaNO₃

Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, identify the limiting reactant.

ammonium phosphate

sodium phosphate

ammonium nitrate

sodium nitrate

19.

4NH₃+ 5O₂--> 4NO + 6H₂O
How much excess reactant is leftover after if 6.30g of ammonia react with 1.80g of oxygen?

9.75 g NH₃

4.80 g O₂

0.765 g NH₃

5.54 g NH₃

20.

How many grams of FeS are formed from 7.62g of Fe reacted with excess S?

3.82g

7.62g

12.2g

11.4g

21.

How many grams of FeS are formed from 7.62g of Fe reacted with excess S?

13.8g

10.2g

12.0g

11.4g

22.

Calculate the concentration of 0.29 mol of NaCl dissolved in 100ml of water

(a)

23.

250 g of hydrogen gas is placed inside a balloon. What volume would it occupy at room temperature?

(a)

24.

How many moles are there in 24 g of ammonia (NH₃). Express your answer using three (3) significant figures.

(a)

25.

Define mole

4 lines

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Mole and Quantitative Chemistry

Total questions: 25

Worksheet time: 49mins

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