Introduction to Moles

Shivani measures out 6.0 moles of epsom salt (MgSO₄) to put in her bath. How many grams of MgSO₄ went in the bath?

• 3.6 x 10²⁴ g

• 720 g

• 0.050 g

• 340 g

Tags

NGSS.HS-PS1-7

To melt the ice, Juan throws 455 g of calcium chloride, CaCl₂ on his sidewalk. How many moles of CaCl₂ did he throw?

• 50,500 moles

• 4.10 moles

• 7.56 x 10^-22 moles

• 111 moles

What would be the size of a mole of jellybeans?

• As big as a large building

• As big as a city

• As big as the planet Earth

• As big as a football field

How many moles of hydrogen gas are needed to react completely with 2.0 moles of nitrogen gas? What is the mole ratio of hydrogen gas to nitrogen gas?

• 1:3

• 3:1

• 1:2

• 2:1

Tags

NGSS.HS-PS1-7

the units for molar mass are...

• g/mol

• mol/mol

• g

• mol

Tags

NGSS.HS-PS1-7

Select the correct molar ratio taken from this balanced equation:

• 1 mol Al = 1 mol Al₂O₃

• 4 Al = 2 Al₂O₃

• 4 mol Al = 2 mol Al₂O₃

• 4 mol Al = 2 mol Al

Tags

NGSS.MS-PS1-5

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

Tags

NGSS.HS-PS1-7

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

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4

• 4:6

• 1:3

• 3:1

Tags

NGSS.HS-PS1-7