Stoichiometry

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

• electronic balance

What is the mole ratio if H₂O is the 'asked for' and H₃PO₄ is 'given' in the following chemical equation?

P₄O₁₀ + 6 H₂O --> 4 H₃PO₄

• 6/4

• 4/6

• 1:4

• 4:1

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

Tags

NGSS.HS-PS1-7

How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas?

Given the reaction: 2H₂ + O₂ → 2H₂O

• 4.4

• 1.1

• 2.2

• 3.3

What is the molar mass of C₆H₁₂O₆? (use the periodic table on the back of the formula sheet)

• 180.18

• 180.12

• 180.24

• 180.06

How many grams are in 7.73 moles of NaCl?

• 476grams

• 460 grams

• 452 grams

• 462 grams

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

Tags

NGSS.HS-PS1-7

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g
• 290 g
• 450 g
• 870 g

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

• 749 g
• 225 g
• 479 g
• 814 g

Tags

NGSS.HS-PS1-7

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas?

Given the reaction: 2H₂ + O₂ → 2H₂O

• 18

• 72

• 36

• 4.5