Unit 9 Stoicheometry

Unit 9 Stoicheometry

11th Grade

79 Qs

quiz-placeholder

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Unit 9 Stoicheometry

Unit 9 Stoicheometry

Assessment

Quiz

Science

11th Grade

Hard

Created by

Barry DeHaan

FREE Resource

79 questions

Show all answers

1.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

How many moles are in 36.0 g of water (H₂O)?

Answer explanation

Molar mass of water is 18.0 g/mol, so 36.0 ÷ 18.0 = 2.00 mol.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following represents a mole ratio from the equation: 2H₂ + O₂ → 2H₂O?
2 mol H₂ : 2 mol H₂O
1 mol H₂ : 1 mol O₂
2 mol O₂ : 2 mol H₂
2 mol H₂O : 1 mol H₂
1 mol H₂O : 2 mol O₂

Answer explanation

From the balanced equation, 2 mol H₂ yields 2 mol H₂O.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which unit is commonly used to express molar mass?
g/mL
g/mol
mol/L
mol/m³
atoms/mol

Answer explanation

Molar mass is expressed in grams per mole (g/mol).

4.

FILL IN THE BLANK QUESTION

30 sec • 1 pt

You have 6.02 × 10²³ molecules of CO₂. How many moles is this?

Answer explanation

6.02 × 10²³ particles = 1 mol (Avogadro's number).

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

From the equation: N₂ + 3H₂ → 2NH₃, what is the mole ratio of H₂ to NH₃?
1:1
3:2
2:3
3:1
2:1

Answer explanation

3 mol H₂ react to form 2 mol NH₃, ratio is 3:2.

6.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Select all correct mole-to-mass conversions.
2 mol Na = 46.0 g Na
1 mol H₂O = 18.0 g
0.5 mol CO₂ = 22.0 g
3 mol O₂ = 96.0 g
1 mol C = 6.02 × 10²³ g

Answer explanation

CO₂ molar mass = 44 g/mol, so 0.5 mol = 22 g. C is 12 g/mol, not 6.02×10²³ g.

7.

FILL IN THE BLANK QUESTION

45 sec • 1 pt

Challenge: How many molecules are in 36.0 g of water (H₂O)?

Answer explanation

36 g ÷ 18 g/mol = 2 mol; 2 × 6.02 × 10²³ = 1.204 × 10²⁴ molecules.

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