Single Step Mole Conversions

How many molecules of water are in a 821.3 g sample?

• 45.58 molecules

• 8.232 x 10²⁵ molecules

• 8.909 x 10²⁷ molecules

• 2.744 x 10²⁵ molecules

How many formula units of calcium chloride are in a 25.69 g sample?

• 1.394 x 10²³ F.U.'s

• 2851 F.U.'s

• .2315 F.U.'s

• 3.845 x 10²⁵ F.U.'s

Tags

NGSS.HS-PS1-7

C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O. A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C₂H₆). What is the final answer for this problem?

• 13 mol C₂H₆

• 3 mol O₂

• 21 mol O₂

• 42 mol O₂

Tags

NGSS.HS-PS1-7

Which conversion factor should be used to solve the following, "How many moles of argon atoms are present in 11.2 L of argon gas at STP?"

• 1 mol = 22.4 L 

• 1 mol = 39.95 g

• 1 mol = 6.02x10²³ atoms

• More than 1

How many moles are in 22 g of argon? 

• 880 moles

• 0.55 moles

• 1.81 moles

• 5 moles

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆? 

• mole = 78.12 g

• mole = 22.4 L 

• mol = 6.02x 10²³ particles 

• more than one

What would be the mass of 9.76 x 10²² formula units of SrCl₂?

• .1622 g

• 25.7 g

• 20.0 g

• .3589 g

Tags

NGSS.HS-PS1-7

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

• 10:6 

• 3:4

• 4:3

• 2:3

Tags

NGSS.HS-PS1-7

Mg_(s) + HCl_(aq) →MgCl_2(aq) + H_2(g)

The reaction of 2.5 mol of HCl will produce ______ mol of MgCl_2.

• 2.5

• 1.25

• 5.0

• 1.0

Tags

NGSS.HS-PS1-7

If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?

• 4 mol H₂O/ 5 mol O₂

• 5 mol O₂/ 4 mol H₂O

• 2 mol O₂/ 4 mol H₂O

• 4 mol O₂/ 2 mol H₂O

Tags

NGSS.HS-PS1-7