Question

Mountain climbers often brew tea by melting snow, which they heat over a stove. Our stove burns butane (C4H10), which has a heat of combustion of -2878 kJ/mol. The temperature of the snow is initially at -20 °C, and we need 80 °C water to brew tea. a. How much heat is needed to turn the snow into a cup (237 mL) of water hot enough to make a cup of tea? b. Calculate the mass of butane needed to fuel the stove for this process.

Answer 1

Q. Change in temperature AT = T2-T - 80°C - (-20°C) = 100 °C mass of waterz (237m2) (1 glm2) = 237g (vxd) Heat capacity of water. 4.186 J/gºc as Heat needed Q = m Cp AT > (2379)( 4.1863/8 €) (100°C) = 99.208 KI b) males of butane needed 99.208 ks = 0.0345 male 2878 kg/meel mass of butane needed = (0.0345 mal ) (58,12 g imeel) -12.003 g)