Moles review

How many water molecules are in 5.2 moles of water?

• 6.02 x 10²³
• 5.2
• 3.1304 x 10²⁴
• 8.638 x 10^-24

How many hydrogen atoms are in 8.46 moles of methane, CH₄?

• 33.84 atoms
• 2.04 x 10²⁵ atoms
• 2.04 x 10²⁵ molecules
• 34 atoms

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

• 40 g
• 80 g
• 16 g
• 32 g

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g
• 19.4 g
• 673 g
• 389 g

How many grams are in 3.3 mol of Potassium Sulfide?

• 360 g
• 454 g
• 238 g
• 132 g

Tags

NGSS.HS-PS1-7

How many atoms are in 0.750 moles of zinc?

• 4.52 atoms of zinc
• 1.25 x 10^-24 atoms of zinc
• 4.52 x 10²³ atoms of zinc

How many moles are 2.85 x 10¹⁸ atoms of iron?

• 4.73 x 10^-6 moles
• 1.72 x 10⁴² moles

Find the percentage composition of  Mg in Mg₃(PO₄)₂.
   

• 27.75% Mg
• 23.57% Mg
• 48.68% Mg
• 13.45% Mg

Tags

NGSS.HS-PS1-7

How many particles are in 13.5 grams of Beryllium?

• 1.5 particles
• 9 particles
• 4x10²³ particles
• 9x10²³ particles

How do you write
1001
in scientific notation?

• 1.0001 x 10⁴
• 1.01 x 10⁵
• 1.001 x 10³
• 10.1 x 10³