Molar Mass and Mole Conversion

How would you set up the problem if you want to find the mass, in grams, of 0.55 moles of silicon?

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)

How would you set up this problem: At STP, 2.5 moles of helium gas will have what volume?

How would you set up this problem to solve it? 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?

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

Fun Fact: some people think that air is a synonym for oxygen, but it is actually 78% nitrogen and only 21% oxygen.

If you have a large balloon filled with 6.0 L of nitrogen at STP, how many moles of N₂ are in that balloon?

• 0.51 moles

• 0.44 moles

• 0.27 moles

• 0.19 moles

How would you set up this question to solve it? An antique neon sign contains 1.5 g of neon. How many moles of neon are in the sign?

An antique neon sign contains 1.5 g of neon. How many moles of neon are in the sign?

• 0.074 moles

• 0.056 moles

• 0.083 moles

• 0.062 moles

Tags

NGSS.HS-PS1-7