Answer to Question #49498 in Organic Chemistry for Joe

Question

Perform each conversion between energy units.
1.07×106kJ to kcal
6.99×103kJ to kWh
7.08×104J to Cal

An unknown mass of each of the following substances, initially at 24.0∘C, absorbs 1970J of heat. The final temperature is recorded as indicated. Find the mass of each substance.
1. Pyrex glass (Tf=55.5∘C)
2.sand (Tf=62.0∘C)
3. ethanol (Tf=44.3∘C)
4. water (Tf=32.2∘C)
A 33.0g iron rod, initially at 22.2∘C, is submerged into an unknown mass of water at 64.0∘C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.7∘C.
1.What is the mass of the water?