LP gas burns according to the exothermic reaction: C3H8( g) + 5 O2( g)¡3 CO2( g) + 4 H2O( g) ΔH °rxn = -2044 kJ What mass of LP gas is necessary to heat 2.50 L of water from room temperature (25.0 °C) to boiling (100.0 °C)? Assume that during heating, 15% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundings. (Assume a density of 1.00 g/mL for water.)

Video transcript

Hi everyone. So ask how much butane gas Ingram's is needed to eat 400 ml of water From 15°C to 67°C. If only 45% of heat is transferred to the water. We call that the amount of heat transferred. It was a mass of the solution, specific heat of the solution. How's the temperature change? So cute is are looking for. We also need to find masks, also specific heat. This 4.186 Joel's program degree Celsius and a temperature change. It's 67 Celsius minus 15 in Greece Celsius, We get 52 very Celsius. So I need to first find the mass of the water. 400 mL. And in one g we have one minute later. And this is the density of water. Just give us 400 g. Now I need to find the amount of heat needed to boil the water. That's cute. Get 400 grams. 4.186. Those programs, Times degrees Celsius, 52°C. Super cute. 87068 0.8 jaws. And if you can write it. Tequila Jules. We have 1000 jewels And one killer job. We get 87.0688 Colonel jules. That's only 45% of the heat is transferred to the water. 45 over 100 Equal to 87.0688 hill jaws about about x. They're gonna have a .45 X 87.0688. Kill Jaws. Sophie to by both sides by . her eggs. Gonna get 193 0.48 62 field goals. And now I need to determine the mass of butane gas of - 0.48 62. Hello jules because he is being transferred And in one mold - 0.3. Hello jules. And in one more, give them all the mass of butane. And this is four 12.011 g past 10. That's 1.008 g. Was 58.12 g. 3.91 g. Thanks for watching my video. And I hope it was helpful.