Aspacecraft is fueled using hydrazine (n2h4; molecular weight of 32 grams per mole [g/mol]) and carries 1640 kilograms [kg] of fuel. on a mission to orbit a planet, the fuel will first be warmed from −186 degrees fahrenheit [°f] to 78 degrees fahrenheit [°f] before being used after the long space flight to reach the planet. the specific heat capacity of hydrazine is 0.099 kilojoules per mole kelvin [kj/(mol k)]. if there is 300 watts [w] of power available to heat the fuel, how long will the heating process take in units of hours [h]?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?