Mixed Stoichiometry Problems

Ammonia is produced from the reaction of nitrogen and hydrogen gases. What volume of hydrogen at STP is required to produce 25 g of ammonia?

N₂(g) + 3H₂(g) → 2NH₃(g)

• 33 L

• 1.1 L

• 49 L

• 25 L

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

lf 25.0 g of aluminum chloride are decomposed, how many molecules of Cl₂ are produced?

• 0.281 molecules Cl₂

• 19.7 molecules Cl₂

• 1.69 x 10²¹ molecules Cl₂

• 1.69 x 10²³ molecules Cl₂

Tags

NGSS.HS-PS1-7

Balance the following reaction:
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)

• 1,2,1,2

• 2,1,1,2

• 1,2,1,1

• 1,2,2,2

Tags

NGSS.HS-PS1-7

N₂ +  3H₂ −->  2NH₃ 
How many moles of ammonia are produced when 3 moles of nitrogen react with hydrogen?

• 6 moles ammonia

• 1.5 moles ammonia

• 9 moles ammonia

• 9 moles hydrogen

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Tags

NGSS.MS-PS1-5

A solution contains 0.5 moles of NaCl. How many grams of NaCl are present in the solution? (Molar mass of NaCl = 58.44 g/mol)

• A) 29.22 g

• B) 58.44 g

• C) 116.88 g

• D) 0.5 g

• A) 3 moles

• B) 6 moles

• C) 9 moles

• D) 12 moles

• D) None