Mass, Volume & Mole Conversions

A beaker contains 3.0 moles of copper. How many grams of copper are in the beaker?

• 190.7 g

• 21.2 g

• 0.047 g

• 86.3 g

Tags

NGSS.HS-PS1-7

A chemist places 2.50 g of iron on a scale. How many moles of iron are on the scale?

• 139.6 moles

• 22.3 moles

• 0.764 moles

• 0.045 moles

To melt the ice, Cindy throws 455 g of calcium chloride, CaCl₂ on her sidewalk. How many moles of CaCl₂ did she throw?

• 50,500 moles

• 4.10 moles

• 0.244 moles

• 111 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?

• 20 g

• 720 g

• 0.050 g

• 340 g

A recipe calls for 12 g of baking soda, NaHCO₃. How many moles of NaHCO₃ go into the recipe?

• 0.058 moles

• 7.0 moles

• 0.14 moles

• 3.4 moles

Tags

NGSS.HS-PS1-7

The recommended daily allowance for sodium is 2.3 g. How many moles of sodium should you get per day?

• 0.10 moles

• 0.075 moles

• 0.23 moles

• 0.0046 moles

Eating a quarter pound hamburger will provide you with 44% of the selenium that you need in a day.

If that hamburger contains 3.1 x 10^-7 moles (or 0.000 000 31 moles) of selenium, how many grams of selenium are in that burger?

• 0.000 000 003 9 g (or 3.9 x 10^-9 g)

• 0.000 000 58 g (or 5.8 x 10^-7 g)

• 0.000 024 g (or 2.4 x 10^-5 g)

• 0.007 80 g (or 7.8 x 10^-3 g)

At STP, 2.5 moles of helium gas will have what volume?

• 9 L

• 56 L

• 27 L

• 72 L

An average breath contains 500 mL of gas. Assuming the air is an ideal gas at STP, how many moles of air are pushed out with each breath?

• 0.022 moles

• 22 moles

• 0.22 moles

• 2.2 moles

Breathing in sulfur hexafluoride will make your voice sound much deeper. How many liters of SF₆ will you need to breathe in at STP to get 0.033 moles inside you?

• 0.062 L

• 0.74 L

• 1.35 L

• 2.26 L