Stoichiometry Particles to Particles

How many particles are in 13.5 grams of beryllium?

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

Given the following reaction, 2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂

Tags

NGSS.HS-PS1-7

From the reaction: B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%
• 0.82%
• 10.1 %
• 100%

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

4 Al + 3 O₂ –> 2 Al₂O₃  How much aluminum would be needed to completely react with 45 grams of O₂?

• 1.05 moles
• 3.75 moles
• 1.875 grams
• 1.875 moles

Tags

NGSS.HS-PS1-7

What is the percent yield of the following reaction if 145g of P₂O₅ reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid? 3 H₂O + P₂O₅ -> 2H₃PO₄

• 80%
• 85%
• 77%
• 58%

Aluminum reacts with H₂SO₄ to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g
• 290 g
• 450 g
• 870 g

How many moles is 4 grams of Calcium?

• 0.10 moles
• 10 moles
• 44 moles
• 160 moles

How many particles are in 13.5 grams of Beryllium?

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