Free Printable CHE 123-Lesson 1(3.4-3.6)

Worksheets

CHE 123-Lesson 1(3.4-3.6)

Total questions: 16

Worksheet time: 4hrs 0mins

Name

Class

Date

How many moles are in 4.5x10²⁴ particles?

0.747 particles

0.747 mol

2.71x10⁴⁷ mol

2.71x10⁴⁷ particles

How many molecules are present in 69.0 moles of SrO?

4.16x10²⁵molecules

8.72x10²¹molecules

7,149.78 molecules

6,893.32 molecules

How many molecules are there in 5.9 moles of NaCl?

3.5x10²⁴molecules

9.79x10^-24molecules

1.02x10²³molecules

How many atoms of iodine are in a mole of iodine?

63.55g

126.9

6.02 x 10²³

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.

Determine the number of moles of AlNO₃ that are in 264 g of the compound.

2.97 mol

3.45 mol

2.73 mol

1.86 mol

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

3.2 mol

1.7 mol

2.1 mol

1.9 mol

Find the mass of 5.82 mol of MgCl₂. Round to the nearest tenth.

552.9 g

436.8 g

55.2 g

555.9 g

Determine the number of moles of Mg₃P₂that are in 583 g of the compound.

2.9 mol

6.1 mol

4.3 mol

1.7 mol

10.

What is the mass of 0.75 moles of (NH₄)₃PO₄?

101.75 g

121.75 g

111.75 g

131.75 g

11.

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

12.

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

SO2

SO3

SO4

13.

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

14.

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

15.

Chloroform, a toxic substance that may cause severe liver, kidney, and heart damage, has the percent composition by mass of this compound is 10.06% carbon, 0.84% hydrogen, and 89.09% chlorine. What is the empirical formula of this compound?

C₃H₃Cl

CH₆Cl₃

CH₃Cl₃

CHCl₃

16.

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

100 %

CHE 123-Lesson 1(3.4-3.6)

Total questions: 16

Worksheet time: 4hrs 0mins

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