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Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

• 1,1,1,1
• 1,2,1,1
• 2,1,1,2
• 2,1,2,1

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

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

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

• 3.8 moles

• 15 moles

• 7.5 moles

• 23 moles

2KClO₃ → 2KCl + 3O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 1.0 mol

• 10.1 mol

• 4.5 mol

The number 6.02 x 10²³ is called...

• Obama's number and it measures the amount of gases or liters in a mole

• Bohr's number and it measures the amount of molecules or atoms in a sample

• Avogadro's number and it measures the amount of gas in moles

• Avogadro's number and it measures the amount of molecules or atoms in a sample

_N₂ + _H₂ → _NH₃

What is the mole ratio between N₂ and NH₃ if you balanced the above equation correctly?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

Which of the following represent a mole ratio between silver nitrate and copper(II) nitrate in the following reaction:

2AgNO₃ + _Cu → _Cu(NO₃)₂ + 2Ag

• 2 : 2

• 1 : 2

• 1 : 1

• 2 : 1

What is the mole used for? 

• To measure the amount of grams in a substance
• To measure the amount of atoms or molecules in a substance
• To measure the amount of energy in a substance
• To measure the amount of bonding in a substance