Free Printable Moles and Chemical Equations

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Moles and Chemical Equations

Total questions: 21

Worksheet time: 1hrs 21mins

Name

Class

Date

Which of the following sets of coefficients correctly balances the above chemical equation?

__Pb(NO₃)₂ + __NaI ⟶

__NaNO₃ + __PbI₂

1:2:1:2

2:1:2:2

1:2:2:1

1:1:1:1

You have 2 moles of graphite (KC₈) in your pencil. How many grams of graphite are in your pencil? (RAM K-39; C-12; Avogadro's constant - 6.02x10²³)

135.19 g

270 g

67.59 g

134 g

How many moles of Francium (Fr) are in 7.4 x 10²⁶ atoms? (RAM Fr - 227; Avogadro's constant - 6.02x10²³)

1.23 moles

44.56 x 10⁴⁹ moles

87 moles

1.23 x 10³ moles Fr

Which of the following statements regarding the mole is INCORRECT?

A mole is a unit of quantity equal to 6.02 x 10²³ particles.

The number of particles in a mole is known as Avogadro’s number.

A mole of particles of an element is numerically equal to the atomic mass of the element.

none of the above

The mass of one mole of an element is equal to

its atomic number from the periodic table, but in amus.

its atomic mass from the periodic table, but in amus.

its atomic mass from the periodic table, but in grams.

its atomic number from the periodic table, but in grams.

What is the molar mass of PbSO₄? (RAM Pb- 207, S-32, O-16)

303 g/mol

255 g/mol

163.87 g/mol

372.27 g/mol

How many formula units are in 2.5 moles of NaCl? (RAM Na-23, Cl-35.5; Avogadro's constant - 6.02x10²³)

1.5 x10²⁴formula units

1.5 formula units

4.2 formula units

4.2 x10^-24molecules

Shivani measures out 6.0 moles of epsom salt (MgSO₄) to put in her bath. How many grams of MgSO₄ went in the bath? (RAM Mg-24; S-32; O-16; Avogadro's constant - 6.02x10²³ )

3.6 x 10²⁴ g

720 g

0.050 g

340 g

How many molecules are there in 31.8 moles of water? RAM H-1; O-16; Avogadro's constant - 6.02x10²³)

5.28 x 10^-23 molecules

1.91 x 10²⁵ molecules

5.28x 10-²⁵

1.91 x 10²²

10.

Determine the mass of 4.20 moles of C₆H₁₂^.(RAM C-12; H-1; Avogadro's constant - 6.02x10²³ )

353 g

0.0499 g

337 g

2.53 x 10²⁴ g

11.

What is the mass of 1.2 x 10²⁴ atoms of C? (RAM C-12; Avogadro's constant - 6.02x10²³)

2.0 grams

24 grams

0.17 grams

1.4 x 10²⁵ grams

12.

Calculate the number of atoms in 0.0340 g Zn (RAM Zn-65; Avogadro's constant 6.02x10²³)

5.20 x 10^-4 atoms Zn

3.13 x 10²³ atoms Zn

3.15 x 10²⁰ atoms Zn

2.05 x 10²² atoms Zn

13.

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃? (RAM Al-27; O-16; H-1; Avogadro's constant - 6.02x10²³)

1.26 moles

0.8 moles

7,670 moles

1.63 x 10^-22 moles

14.

To melt the ice, Juan throws 455 g of calcium chloride, CaCl₂ on his sidewalk. How many moles of CaCl₂ did he throw? (RAM Ca-40; Cl- 35.5; Avogadro's constant - 6.02x10²³)

50,500 moles

4.10 moles

7.56 x 10^-22 moles

111 moles

15.

How many moles are in 4.5x10²⁴ particles?

0.747 particles

7.48 mol

2.71x10⁴⁷ mol

2.71x10⁴⁷ particles

16.

What is the molar mass of Mg₃N₂? (RAM Mg-24; N-14)

191.6 g/mol

77 g/mol

38 g/mol

100 g/mol

17.

2H₂ + O₂ → 2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

4 moles

8 moles

16 moles

2 moles

18.

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe/ 2 mol Fe

3 mol MgO / 2 mol Fe

19.

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

6.7 mol

1.0 mol

10.1 mol

4.5 mol

20.

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen are produced if 120 g of Na are available? (RAM Na - 23; H-1; O-16)

5.2 g

2.6 g

690 g

45 g

21.

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂

How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum? (RAM Al-27; H-1; S-32; O-16)

0.85 g

291 g

450 g

870 g

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Moles and Chemical Equations

Total questions: 21

Worksheet time: 1hrs 21mins

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