5)
A substance requires 345 J of heat to raise the temperature from 17 oC to 48 oC. . If the mass of the substance is 25 g, what is the specific heat of the substance?
6)
18 g of zinc was heated from 50°C to 85°C. How much energy was used to heat Zn? (Specific heat capacity of Zn 0.440 J/g °C)
7)
A metal with a specific heat of 0.900 J/g oC requires 1,070 J of heat to raise the temperature (the change in temperature) by 25 oC. What is the mass of the metal?

Is this a single replacement reaction or there is no

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

The following reaction shows the products when sulfuric acid and aluminum hydroxide react. al(oh)3 + h2so4 → al2(so4)3 + h2o the table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory. sulfuric acid aluminum hydroxide initial amount of reactant 40 g 15 g theoretical yield of water from reactant 14.69 g 10.38 g what is the approximate amount of the leftover reactant? 11.73 g of sulfuric acid 10.33 g of sulfuric acid 11.12 g of aluminum hydroxide 13.67 g of aluminum hydroxide