Chemistry Molar Mass

How many moles are in 20 grams of Ca (Calcium)?

• 0.5 

• 1

• 3

• 20

How many molecules are in 2.5 mol of NaCl?

• 1.5x10²³

• 146

• 4.15

• 1.5x10²⁴

How many atoms of carbon are in 6.00g of carbon?

• 20x10²⁴atoms C

• 6.02x10²³atoms C

• 3.01x10²³atoms C

• 1.50x10²³atoms C

The mass of 5.78 dm³of Cl₂ at STP is...

• 16.78g

• 22.09g

• 18.29g

• 98.66g

What is the mass of 2.50 mol of oxygen gas O₂?

• 40.0 g

• 80.0 g

• 16.0 g

• 32.0 g

How many molecules are in 32.4 grams of phosphorous pentoxide?

• 76 x 10²³ molecules

• 0.29 moles

• 76 x 10²² molecules

• 0.29 molecules

How many atoms would be contained in 454 grams of iron (Fe)?

• 6.02x10²³ atoms

• 8.14 atoms

• 4.90x10²⁴ atoms

• 55.85x10²³ atoms

To convert from moles to grams, you should multiply by ....

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To convert from grams to moles, you should multiply by ....

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What is the molar mass of NaCl?

• 49.46 g/mol

• 58.44 g/mol

• 152.92 g/mol

• 161.90 g/mol