Mole and Quantitative Chemistry

In the following equation, what is the molar ratio between hydrochloric acid and copper(II) oxide?

2 HCl + CuO → CuCl₂ + H₂O

• 1 : 2

• 2 : 1

• 1 : 1

In an experiment, the actual yield is 8.4 g but the theoretical yield is 17.0 g. what is the percentage yield?

• 24.7 %

• 50.6 %

• 49.4 %

When the equation below is balanced, what is the coefficient for oxygen?

__C₂H₂(g) + __O₂(g) → __ CO₂(g) + __ H₂O(g)

• 2

• 3

• 4

• 5

Ethyne, C₂H₂, reacts with oxygen according to the equation below. What volume of oxygen (in dm³) reacts with 0.40 dm³ of C₂H₂? (STP)

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)

• 0.40

• 0.80

• 1.0

• 2.0

How many oxygen atoms are present in 0.0500 mol carbon dioxide?

• 3.01×10²²

• 6.02×10²²

• 6.02×10²³

• 1.20×10²⁴

What mass (g) of potassium hydroxide (KOH) is needed to make up 500 cm³ of a solution of concentration 0.2 mol.dm^-3?

• 2.8

• 11.2

• 5.6

• 0.56

What mass of CO₂ will be produced when 50 g of CaCO₃ decomposes?

CaCO₃ → CO₂ + CaO

• 22 g

• 44 g

• 11 g

• 33 g

What is the percentage by mass of carbon in calcium carbonate CaCO₃?

• 12

• 40

• 48

What is the mass of one mole of (NH₄)₂CO₃?

• 144g
• 138g
• 96g
• 74g

4.0 moles of H₂O would have what mass?

• 72 g
• 23 g
• 68 g
• 4.5 g

Tags

NGSS.HS-PS1-7