Honors: Stoichiometry

How many grams are there in 4 moles of H₂O?

• 64

• 38

• 72

How many moles are there in 51 grams of NH₃?

• 1 mole

• 2 moles

• 3 moles

How many grams are there in 2 moles of NH₃?

• 17 grams

• 28 grams

• 34 grams

• 51 grams

Fluorine is diatomic. What is the molar mass of Fluorine gas?

• 19.0 g/mol

• 9 g/mol

• 38.0 g/mol

• 18.0 g/mol

What is the mass of 4.5moles of CH₄?

• 72.0 g

• 68 g

• 72.0 mol

• 0.3 mol

How many moles are in 150 grams of Na₂SO₄?

• 142.1 g/mol

• 1.1 mol

• 21 315 g

• 21 315 mol

If I need 20.4 moles of sodium chloride, how much should I weigh out?

• 0.549 g
• 112 g
• 1192 g
• 5077 g

Which is heaviest - a mole of copper or a mole of lithium?

• mole of copper
• mole of lithium
• they have the same mass

A scientist shows you a 2.25-mol sample of carbon and a 2.25-mol sample of selenium.  Which of the following is true?

• they have the same mass
• they have the same volume
• they have the name number of atoms
• they have the same density

How many atoms are there in 3.2 grams of sulfur?

• 6.022 x 10²³ atoms S
• 6.022 x 10²² atoms S
• 0.031 atoms S
• 1.66 x 10^-24 atoms S