Stoichiometry Mole Conversions

What is the GFM of PbSO₄?

• 303.27 g/mol

• 255.27 g/mol

• 163.87 g/mol

• 372.27 g/mol

How many molecules are in 2.5 moles of NaCl?

• 1.5 x10²⁴ molecules

• 1.5 molecules

• 4.2 molecules

• 4.2 x10^-24 molecules

You want to measure out 6.0 moles of epsom salt (MgSO₄) to put in your bath. How many grams of MgSO₄ is that?

• 3.6 x 10²⁴ g

• 720 g

• 0.050 g

• 340 g

How many molecules are there in 31.8 moles of water?

• 5.28 x 10^-23 molecules

• 1.91 x 10²⁵ molecules

• 5.28x 10-²⁵

• 1.91 x 10²²

Determine the mass of 4.20 moles of C₆H₁₂

• 353 g

• 0.0499 g

• 337 g

• 2.53 x 10²⁴ g

Tags

NGSS.HS-PS1-7

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles

• 0.8 moles

• 7,670 moles

• 1.63 x 10^-22 moles

Tags

NGSS.HS-PS1-7

To melt the ice, you throw 455 g of calcium chloride, CaCl₂ onto the sidewalk. How many moles of CaCl₂ did you throw?

• 50,500 moles

• 4.10 moles

• 7.56 x 10^-22 moles

• 111 moles

Four students tried to balance the following Reaction:

Mg + Fe₂O₃ → MgO + Fe

Which student is correct?

• 3Mg + Fe₂O₃ → 3MgO + 2Fe

• Mg + Fe₂O₃ → MgO₃+ Fe₂

• 2Mg + Fe₂O₂ → 2MgO + 2Fe

• 3Mg + 2Fe₂O₃ → 3MgO + 2Fe

Tags

NGSS.HS-PS1-7

48.86 g of cobalt is equal to how many moles of cobalt?

• 2879 moles

• 8.291 moles

• .8291 moles

• .829 moles

Tags

NGSS.HS-PS1-7

How many molecules of water (H₂O) 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