Free Printable HW 1: INTRODUCTION TO MOLES AND EMPIRICAL FORMULA

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HW 1: INTRODUCTION TO MOLES AND EMPIRICAL FORMULA

Total questions: 23

Worksheet time: 6hrs 45mins

Name

Class

Date

How many moles are in 4.5x10²⁴ particles?

0.747 particles

0.747 mol

2.71x10⁴⁷ mol

2.71x10⁴⁷ particles

What is the molar mass of Mg₃N₂?

191.6 g/mol

76.64 g/mol

38.32 g/mol

100.95 g/mol

What is the mass of one mole of Al₂(SO₄)₃?

75.04 g

342.14 g

75.04 mol

342.14 mol

How many moles of carbon atoms are there in 5g of carbon?

60 mol

17 mol

0.42 mol

7 mol

How many molecules are there in 5.9 moles of NaCl?

3.5x10²⁴molecules

9.79x10^-24molecules

1.02x10²³molecules

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 moles are there in 12.7g of CaF₂?

0.20 mol

1,000.76 mol

6.14 mol

0.16 mol

What is the mass of 9.4 moles of B₂(Cr₂O₇)₃?

6.41 x 10²²g

5.67x10²⁴ g

49.11 g

4,339.23 g

none of these

What is the mass of 54.3x10⁴⁵molecules of BeO?

3.27x10⁷⁰ g

9.01 x10²²g

2.25 x10²⁴ g

1.31 x10⁶⁹g

10.

A mole of Neon contains
6.02 x 10²³_____.

atoms

formula units

ions

molecules

11.

Avogadro's number of representative particles is equal to one_____.

kilogram

gram

kelvin

mole

12.

Which of the following is considered an empirical formula?

CH₃COOH

C₆H₁₂O₆

H₂O

Mg₂Cl₄

13.

Which pair of molecules would have the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

14.

Basic aluminium diacetate – Its molecular formula is HOAl(CH₃CO₂)₂How many total atoms are in this molecule?

15.

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

16.

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

SO2

SO3

SO4

17.

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

18.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.

What is the empirical formula of J?

C₄HNO₂

CH₂N₂O

C₂HNO₂

CHNO

19.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.

What is the empirical formula of J?

C₄HNO₂

CH₂N₂O

C₂HNO₂

CHNO

20.

Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.

CrCl

CrCl₃

Cr₃Cl

Cr₂Cl₆

21.

CH₄N₂0

CH₄N0

CHN₂0

C₂H₄N₂0₈

22.

What do you do when you get a half in the ratio?

add 2 to each element
add two to only the one with the half

multiply the one with the half only by two

multiply all of them by two

add two to all of the ratios

23.

What is the best definition for coefficient?

The big number that tells you the number of molecules.

The little number that tells the number of atoms for each element.

The atomic number

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HW 1: INTRODUCTION TO MOLES AND EMPIRICAL FORMULA

Total questions: 23

Worksheet time: 6hrs 45mins

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