Thermochemistry Q=mc(delta)T

How much heat is needed to raise the temperature of 50 g of iron by 15°C? (specific heat of iron = 0.444 J/g°C)

• 333 J

• 33.3 J

• 33300 J

• 3330 J

An alloy has a specific heat of 1.25 cal/g°C and is at 25 °C. When it is dropped into warm water, the alloy absorbs 750 cal of heat. If the final temperature of the alloy is 75 °C, what is its mass?

• 12 g

• 2.4 g

• 24 g

• 36 g

The specific heat of gold is 0.129 J/g°C. How many joules of energy are needed to warm 4.5 g of gold from 25.0°C to 100°C?

• 43.5 J

• 53.4 J

• 2.42 J

• 783 J

What are the units of Q (heat)?

• Joules or calories

• grams

• °C or K

• J/g°C or cal/g°C

What are the units of c (specific heat)?

• Joules or calories

• grams

• °C or K

• J/g°C or cal/g°C

What is the formula for ΔT?

• T_f - T_i

• T_i - T_f

• T_i + T_f

• T_f x T_i