Chemistry Final Exam Review Units 8-10

Ammonia (NH₃) is used to make fertilizer. If you have 2.5 mol of ammonia, how many grams of H₂ did you start with? N₂ + 3 H₂ → 2 NH₃

• 1.96 g H₂
• 75 g H₂
• 7.5 g H₂

• 6.0 g H₂

Calculate the number of moles of KCl if you have 2.0 g of it.

• 0.0265 moles KCl

• 3.37 moles KCl
• 0.297 moles KCl
• 3.36 moles KCl

How many grams of sodium chloride can be produced from 5 g of sodium in the presence of excess chlorine? 2 Na + Cl₂ → 2 NaCl

• 140 g
• 13 g

• 70. g
• 44 g

If you have 3 moles of Na and 1 moles of Cl₂, which is the limiting reagent? 2 Na + Cl₂ → 2 NaCl

• Na
• Cl₂
• NaCl
• there is no limiting reagent

If a reaction is supposed to produce 17 g of product, but you only get 12 g, what was the percent yield of the reaction?

• 10%
• 71%

• 80%
• 170%

If the pressure exerted by a gas at 25℃ in a volume of 4.5 L is 3.0 atm, how many moles of gas are present?

• 0.55 moles
• 6.6 moles
• 0.045 moles
• 37.5 moles

Convert 140 mmHg to atm?

• 4.5 atm
• 2.2 atm
• 0.18 atm

• 0.22 atm

You have 0.22 L of NO₂ at a temperature of 295K and a pressure of 0.88 atm. What volume will the NO₂ gas occupy at 0.77 atm and 314 K?

• 0.16 L
• 0.27 L
• 2.9 L
• 1.7 L

What is temperature?

• a form of heat transfer where energy is radiated in the form of rays
• a form of heat transfer
• a form of energy contained in an object associated with the motion of molecules
• a measure of the hotness or coldness of an object.

When you increase the temperature of a gas, the gas molecules _______.

• move faster
• move slower
• move at the same speed
• collide less