Stoichiometry Pre Test

How many grams are in 1 mole of O₂?

• 8

• 16

• 24

• 32

Tags

NGSS.HS-PS1-7

2Na + 2H₂O = 2NaOH + H₂ if you react 50.0 grams of sodium, how many grams of water are needed.

• 25.0

• 39.2

• 46.7

• 50.0

Tags

NGSS.HS-PS1-7

How many particles are in a mole?

• 602

• 602 million

• 602 moles

• 6.02 x 10²³

How many water molecules are in 5.2 moles of water?

• 6.02 x 10²³

• 5.2

• 3.1304 x 10²⁴

• 8.638 x 10^-24

How many moles of oxygen are needed for the complete combustion of 12.0 moles of CH₄(g)?

• 24mol O₂

• 6mol O₂

• 4mol O₂

• 12mol O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of ammonia (NH_3) are produced when 10.0 mole of nitrogen reacts?

• 340g NH₃

• 85g NH₃

• 170g NH₃

• 10mol NH₃

Tags

NGSS.HS-PS1-7

In this reaction, Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂, what is the total number of moles of CO used to produce 28 grams of iron?

• 0.75 mol CO

• 1.5 mol CO

• 0.35 mol CO

• 0.5mol CO

Tags

NGSS.HS-PS1-7

What is the total number of grams of O₂( g) needed to react completely with 4.0 mole of C₂H₂( g)?

• 320g O₂

• 160g O₂

• 25.6g O₂

• 12.8g O₂

Tags

NGSS.HS-PS1-7

What is the mole ratio of O₂ consumed to water produced?

• 1:2

• 2:1

• 2:2

Tags

NGSS.MS-PS1-5

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 1.0 mol

• 10.1 mol

• 4.5 mol

Tags

NGSS.HS-PS1-7