Mole and mass quiz chem

The mass of 6.02 x 10^23 atoms of an element is equal to

• its atomic number from the periodic table, but in amus.

• its atomic mass from the periodic table, but in amus.

• its atomic mass from the periodic table, but in grams.

• its atomic number from the periodic table, but in grams.

Shivani measures out 6.0 moles of epsom salt (MgSO₄) to put in her bath. How many grams of MgSO₄ went in the bath?

• 3.6 x 10²⁴ g

• 720 g

• 0.050 g

• 20 g

Determine the mass of 4.20 moles of C₆H₁₂

• 353 g

• 0.0499 g

• 20 g

• 100.8 g

How would you set up the problem if you have a sample of 2.50 g of sodium (Na), how many moles of Na do you have?

•  $2.50g\ Na\ \times\frac{22.99\ mol\ Na}{1\ g\ Na}=$  

•  $2.50\ g\ Na\ \times\frac{1\ mol\ Na}{22.99\ g\ Na}=$  

•  $2.50\ g\ Na\ \times\frac{22.99\ g\ Na}{1\ mol\ Na}=$  

•  $2.50\ g\ Na\ \times\frac{1\ g\ Na\ }{22.99\ mol\ Na}=$  

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

•  $0.55\ mol\ Si\ \times\ \frac{28.09\ g\ Si}{1\ mol\ Si}\ =\$  

•  $0.55\ mol\ Si\ \times\frac{1\ g\ Si\ }{28.09\ mol\ Si}=$  

•  $0.55\ mol\ Si\ \times\frac{28.09\ mol\ Si}{1\ g\ Si}=$  

•  $0.55\ mol\ Si\ \times\frac{1\ mol\ Si}{28.09\ g\ Si}=$  

If you're converting between grams and moles you need to use:

• 1 mole = 6.022x10²³ things

• the metric prefix chart

• molar mass

• the atomic number

How many moles are in 16.94 g of water H2O?

• 0.996 mol H₂O

• 0.9401 mol H₂O

• 305.3 mol H₂O

• 1.063 mol H₂O

How many moles are present in 32.3 grams of carbon dioxide?

• 44.01 moles

• 1.15 moles

• 1.36 moles

• 0.73 moles

What is the molar mass of Al₂(SO₄)₃?

• 75 g
• 342 g 
• 79 g
• 27 g

How many grams are there in 0.500 mol iron (III) oxide Fe2O3?

• 319.2 g

• 79.9 g

• 398.8 g

• 99.7 g