Stoichiometry

What is the molar mass of Mg(NO₃)₂

• 148 g/mol
• 134 g/mol
• 54 g/mol

How many grams are in 7.8 moles of NaCl?

• 476grams
• 460 grams
• 452 grams
• 462 grams

How many moles are in 19.82 g Mg? 

• 1.226mol Mg
• 481.7mol Mg
• 1.000mol Mg
•  0.82 mol Mg

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

What is the mole ratio in the following reaction:
2CO  +  O₂  → 2CO₂

• 2:1:2
• 1:1:1
• 1:2:1
• Have no clue what a mole ratios is!!

Tags

NGSS.HS-PS1-7

Calculate the molar mass of Mg(OH)_2.

• 33 g/mol
• 41 g/mol
• 86 g/mol
• 58 g/mol

How many grams are in 3.3 mol of Potassium Sulfide (K₂S)?

• 363 g
• 454 g
• 238 g
• 132 g

What is the molar mass of CH₄?

• 16
• 10
• 13
• 48

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

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

• 6 moles Fe
• 4 moles Fe
• 2 moles Fe
• 1 moles Fe

Tags

NGSS.HS-PS1-7