Stoichiometry Practice

Given the equation: Zn + 2 HCl → ZnCl₂ + H₂ How many moles of HCl would be required to produce a total of 4.0 grams of H₂?

• 0.5

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

Given the reaction: 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂ What is the total number of grams of water needed to make 2.5 moles of C₆H₁₂O₆?

• 45

• 108

• 216

• 270

Given the reaction: Mg + 2 HCl → MgCl₂ + H₂ What is the total number of grams of Mg consumed when 0.50 mole of H₂ is produced?

• 6.0 g

• 12 g

• 3.0 g

• 24 g

Tags

NGSS.HS-PS1-7

Given the reaction: 4 Al + 3 O₂ → 2 Al₂O₃ What is the total number of moles of aluminum oxide that can be formed when 2.0 moles of aluminum reacts completely with oxygen?

• 1.0 mole

• 2.0 moles

• 3.0 moles

• 4.0 moles

Tags

NGSS.MS-PS1-5

A number written in front of a chemical formula is called a(n)

• subscript

• superscript

• yield

• coefficient

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number to the left of a formula.

Given the balanced equation representing a reaction: CaO(s) + CO₂(g) → CaCO₃(s) + heat What is the total mass of CaO(s) that reacts completely with 88 grams of CO₂(g) to produce 200 grams of CaCO₃(s)?

• 56 g

• 88 g

• 112 g

• 288 g

Tags

NGSS.HS-PS1-7

Given the reaction: 2 H₂ + O₂ → 2 H₂O The total number of grams of O₂ needed to produce 3 moles of water is

• 36

• 48

• 61

• 75

Tags

NGSS.HS-PS1-7

Given the reaction: Mg + H₂SO₄ → MgSO₄ + H₂ How many grams of H₂SO₄ are needed to produce exactly 11.2 liters of H₂, measured at STP? (Hint:@ STP 1 mol of any gas occupies 22.4 L)

• 24.5

• 49.0

• 98.0

• 196