Do Now - Limiting Reactant in Stages

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol

• 35.453 g/mol

• 22.990 g/mol

• 58.44 g/mol

Calculate the molar mass of Ba(C₂H₃O₂)₂

_{CHECK SIG FIGS}

• 255.42 g/mol

• 255.418 g/mol

• 255. g/mol

• 255.4 g/mol

A student measured 88.0 grams of H₂O (18.02 g/mol) on a scale. How many moles will be used in the reaction?

• 4.88 moles

• .54 moles

• 6.67 moles

• 4.883 moles

• 0.205 moles

73.60 grams of AlBr₃ (266.68 g/mol) are produced from a reaction weighed on a scale. How many moles were produced?

• .273 moles

• 3.623 moles

• 3.6234 moles

• 0.2760 moles

• 0.27599 moles

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass
• our minds

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 5 moles of nitrogen?

• 6 mol
• 2 mol
• 3 mol
• 15 mol

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

What is a Limiting Reactant?

Select TWO

• Reactant that makes/yields the smallest product

• The reactant that is used up first

• The reactant that remains after another is used up

• Reactant that makes/yields the most product