Mole Quiz #1.5

What is the molar mass of barium nitrate

• 261.3 g/mol

• 183.3 g

• 320.6 g/mol

• 183.3 u

Calculate the mass of 0.470 mol of copper (II) chloride

• 63.3 g

• 46.53 g

How many moles would be in 178 g of calcium carbonate?

• 1.78 mol

• $1.78\ x\ 10^{4\ ^{ }}mol$

• 2.61 mol

• 1.8 mol

If 0.642 mol of Methyl ethanoate has a mass of 47.56 g

• 74.08 g/mol

• 74.1 g/mol

• 30.53 g/mol

• 30.5 g/mol

• $1.3\ x\ 10^{-2}\ \frac{g}{mol}$

A sample of an unknown compound has a mass of 85.7 g for 0.450 mol of the sample. Identify the compound:

• MgBr₂

• SrCl₂

• CuI

• CuI₂

Calculate the volume of 6.75 mol of C₄H_10(g) at STP.

• 151.2 L

• 151 L

• 391.5 L

• 391 L

Calculate the mass of 653 mL of SO_2(g) at STP.

• 1.87 g

• 1868.6 g

• 0.228 g

• 228.2 g

If 6.75 mol of C₂H_8(g) occupies 151 L at STP, what volume would 6.75 mol of CH_4(g) occupy?

• It would also occupy 151 L because 1 mol of all gases at STP occupy 22.4 L

• It would occupy 75.5 L because the molar mass of CH_4(g) is half that of C₂H_8(g).

• it would occupy 22.4 L because at STP all gases occupy that volume.

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

• 1 mole = 78.12 g

• 1 mole = 22.4 L

• 1 mol = 6.02x 10²³ particles

• more than one

How many moles of methane (CH₄) are in 1.24 x 10²³ molecules of methane?

• 6.02 x 10²³

• 7.46 x 10⁴⁶

• 978

• 0.206