AP Chemistry Stoichiometry FRQ

How many particles are in 13.5 grams of Beryllium?

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

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

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
• 12.4 g O₂

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
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

Using the following equation:
2I₂(s) + KIO₃(aq) + 6HCl(aq) --> 5ICl(aq) + KCl(aq) + 3H₂O(l)
Calculate how many grams of iodine are needed to prepare 28.6 grams of ICl by this reaction.

• 17.88 g I₂
• 34.77 g I₂
• 29.50 g I₂
• 5.61 g I₂

C₅H₁₂O (l) combusts in air.  How many grams of water are produced when 56.44 grams of C₅H₁₂O combusts? Hint:  write and balance the equation of C₅H₁₂O plus oxygen yield carbon dioxide and water.

• 69.21 g H₂O
• 55.44 g H₂O
• 20.55 g H₂O
• 35.46 g H₂O

Tags

NGSS.HS-PS1-7

Using the following equation:
4NH₃(g) + 5O₂(g) --> 4NO(g) + 6H₂O(l)
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia?

• 45.08 g O₂
• 133.33 g O₂
• 260.77 g O₂
• 75.92 g O₂

Tags

NGSS.HS-PS1-7

How many moles are in 6x10²² particles of CO₂?

• 0.1 moles
• 4.4 moles
• 10 moles
• 264 moles

How many moles is 4 grams of Calcium?

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

N₂ +  3H₂ −->  2NH₃ 
How many moles of hydrogen are needed to react with 1 mole of nitrogen?

• 3
• 2
• 1
• 4