A cannonball made of iron has a volume of 121 cm3. What is the mass, in kilograms, of the cannonball? Express your answer to three significant figures and include the appropriate units.

How would you reduce the volume of gas

What material does not melt at any temperature

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?