Quiz about Empirical Formula Chemistry

Question 1

Which is the correct formula for: 3 Hydrogen (H) 1 Sulfur (S) 4 Oxygen (O)

Accepted Answer

H3SO4

Answer

HSO4

Answer

H4S3O

Answer

H2O

Question 2

Zoe, Abigail, and James are studying chemistry together. They come across a compound with the formula Si₂F₆. They start debating about the empirical formula of this compound. Can you help them?

Accepted Answer

SiF3

Answer

SiF

Answer

Si2F6

Answer

Si6F2

Question 3

Henry, Samuel, and Maya were studying chemistry together. They came across a compound C₂F₆ and started discussing its empirical formula. Can you help them choose the correct empirical formula?

Accepted Answer

CF3

Answer

CF

Answer

C2F6

Answer

C6F2

Question 4

Grace, Nora, and Avery are studying chemistry. They come across the molecule CO₂ and wonder how many "C" are in it. Can you help them?

Accepted Answer

1

Answer

2

Answer

0

Answer

3

Question 5

If a compound has an empirical formula of $$C_2H_5$$ and a molecular weight of 58 g/mol, what is its molecular formula?

Accepted Answer

$$C_4H_{10}$$

Answer

$$C_2H_5$$

Answer

$$C_3H_8$$

Answer

$$C_5H_{12}$$

Question 6

If the empirical formula of a compound is $$CH_2$$ and its molecular weight is 56 g/mol, what is the molecular formula?

Accepted Answer

$$C_4H_8$$

Answer

$$C_2H_4$$

Answer

$$C_3H_6$$

Answer

$$C_5H_{10}$$

Question 7

Which of the following is a correct example of an empirical formula?

Accepted Answer

$$CH_2O$$

Answer

$$C_6H_{12}O_6$$

Answer

$$C_2H_4O_2$$

Answer

$$C_3H_6O_3$$

Question 8

A compound has an empirical formula of $$NO_2$$ and a molecular weight of 92 g/mol. What is its molecular formula?

Accepted Answer

$$N_2O_4$$

Answer

$$NO_2$$

Answer

$$N_3O_6$$

Answer

$$N_4O_8$$

Question 9

Calculate the empirical formula for a compound with 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

Accepted Answer

CH2O

Answer

C3H6O

Answer

CH3O2

Answer

C2H4O2

Question 10

What is the relationship between the empirical formula and the molecular formula?

Accepted Answer

The empirical formula is a simplified ratio, while the molecular formula shows the actual number of atoms.

Answer

The empirical formula and molecular formula are identical.

Answer

The empirical formula is always larger than the molecular formula.

Answer

The molecular formula is a simplified ratio, while the empirical formula shows the actual number of atoms.

Question 11

What is the molecular formula for a compound with an empirical formula of CH2 and a molar mass of 28 g/mol?

Accepted Answer

C2H4

Answer

C2H2

Answer

C3H6

Answer

CH4

Question 12

If the empirical formula of a compound is C3H4, what is its molecular formula if its molar mass is 72 g/mol?

Accepted Answer

C6H8

Answer

C4H6

Answer

C5H10

Answer

C3H4

Question 13

Which pair has the same empirical formula?

Accepted Answer

C₂H₄O₂ and C₆H₁₂O₆

Answer

NaCrO₄ and Na₂Cr₂O₇

Answer

C₃H₆O₃and C₂H₆O₂

Answer

CH₄ and C₂H₆

Question 14

A formula with the lowest whole # ratio of elements in a compound is called

Accepted Answer

Empirical Formula

Answer

Molecular Formula

Answer

Chemical Formula

Answer

Distance Formula

Question 15

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

Accepted Answer

Na3PO4

Answer

NaPO2

Answer

Na2PO3

Answer

NaPO4

Question 16

What is the empirical formula of a compound with a molecular formula of $$C_6H_{12}O_6$$ ?

Accepted Answer

$$CH_2O$$

Answer

$$C_6H_{12}O_6$$

Answer

$$C_3H_6O_3$$

Answer

$$C_2H_4O_2$$

Question 17

A compound is found to contain 40% sulfur and 60% oxygen by mass. What is its empirical formula?

Accepted Answer

$$SO_3$$

Answer

$$SO_2$$

Answer

$$S_2O_3$$

Answer

$$S_2O_2$$

Question 18

Which of the following compounds has the same empirical formula as $$C_4H_8$$ ?

Accepted Answer

All of the above

Answer

$$C_2H_4$$

Answer

$$C_6H_{12}$$

Answer

$$C_8H_{16}$$

Question 19

If a compound has an empirical formula of $$CH_2$$ and a molecular weight of 84 g/mol, what is its molecular formula?

Accepted Answer

$$C_6H_{12}$$

Answer

$$C_3H_6$$

Answer

$$C_4H_8$$

Answer

$$C_5H_{10}$$

Question 20

A compound has an empirical formula of $$P_2O_5$$ and a molecular weight of 283.88 g/mol. What is its molecular formula?

Accepted Answer

$$P_4O_{10}$$

Answer

$$P_2O_5$$

Answer

$$P_6O_{15}$$

Answer

$$P_8O_{20}$$

Question 21

What is the empirical formula of a compound that contains 85.7% carbon and 14.3% hydrogen by mass?

Accepted Answer

$$CH$$

Answer

$$CH_2$$

Answer

$$C_2H_3$$

Answer

$$C_3H_4$$

Question 22

Which of the following is NOT an empirical formula?

Accepted Answer

$$C_6H_{12}O_6$$

Answer

$$C_2H_4O_2$$

Answer

$$CH_2O$$

Answer

$$C_3H_6O_3$$

Question 23

A compound with a molecular formula of $$C_5H_{10}O_5$$ has what empirical formula?

Accepted Answer

$$CH_2O$$

Answer

$$C_5H_{10}O_5$$

Answer

$$C_2H_4O_2$$

Answer

$$C_3H_6O_3$$

Question 24

If a compound has an empirical formula of $$C_2H_5$$ and a molecular weight of 58 g/mol, what is its molecular formula?

Accepted Answer

$$C_4H_{10}$$

Answer

$$C_2H_5$$

Answer

$$C_3H_8$$

Answer

$$C_5H_{12}$$

Question 25

What is the empirical formula of a compound with 36.8% nitrogen and 63.2% oxygen by mass?

Accepted Answer

$$NO_2$$

Answer

$$NO$$

Answer

$$N_2O_3$$

Answer

$$N_2O_5$$

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