Energy Conversion and Reaction Types

The video tutorial covers enthalpy calculations using a reaction involving methanol, carbon monoxide, and hydrogen. It explains the concept of endothermic reactions and how to represent them with energy diagrams. The tutorial provides step-by-step calculations for determining energy in joules and calories based on given moles of reactants. It also includes a conversion of energy for a specific mass of carbon monoxide, emphasizing the importance of significant figures and conversion factors.

What type of reaction is the production of methanol from carbon monoxide and hydrogen?

• Neutral

• Spontaneous

• Endothermic

• Exothermic

In an endothermic reaction, how does the potential energy of the products compare to the reactants?

• Unrelated to the reactants

• Less than the reactants

• Equal to the reactants

• Greater than the reactants

How much energy in joules is consumed when 3.5 moles of carbon monoxide react?

• 32,000 joules

• 315,000 joules

• 320,000 joules

• 315 joules

What is the conversion factor from kilojoules to joules?

• 1 kilojoule = 10,000 joules

• 1 kilojoule = 100,000 joules

• 1 kilojoule = 1,000 joules

• 1 kilojoule = 100 joules

How many significant figures should be used in the final answer for energy in joules?

• Two

• One

• Four

• Three

What is the energy absorbed in calories when 2.25 moles of hydrogen gas react?

• 24,000 calories

• 242,000 calories

• 24,200 calories

• 2,420 calories

What is the conversion factor from joules to calories?

• 1 calorie = 4.184 joules

• 1 calorie = 2.184 joules

• 1 calorie = 5.184 joules

• 1 calorie = 3.184 joules

What is the molar mass of carbon monoxide (CO)?

• 12.01 g/mol

• 28.01 g/mol

• 44.01 g/mol

• 16.00 g/mol

How much energy in kilojoules is absorbed when 25.0 grams of carbon monoxide is consumed?

• 70.3 kJ

• 100.3 kJ

• 90.0 kJ

• 80.3 kJ

What is the first step in calculating energy absorbed when given mass in grams?

• Convert grams to moles

• Convert moles to grams

• Convert joules to calories

• Convert kilojoules to joules