9. What is the result of multiplying 2.5 1010 by 3.5 x 10-2?

A 8.75 x 10-3

B 8.75 108

C 8.75 1017

D 8.75 10-17

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)