Question

Homework: Name: 1. At the top of Mount Everest, water boils at 70 °C. Explain why this is lower than its usual boiling point of 100°C. 2. a) How much heat is needed to heat 33.9 g of acetone (C3H.O) from 25.0°C to its boiling point of 56.05°C? (Specific heat of acetone is 2.15 J/g.C) b) How much heat is required to vaporize 33.9 g of acetone at its boiling point? (AHvap for acetone is 29.1 kJ/mole) 3. How much heat does your body lose when 5.86 g of sweat evaporates from your skin (Assume that the sweat is only water.) AHvap for water is 44.0 kJ/mole. 4. Write the type of solid (Molecular, ionic, metallic, or covalent network solid) next to cach solid and then arrange the solids from lowest to highest melting point a) C(s, diamond) b) Kr(s) c) NaCl(s) d) H2O(s)

Answer 1

0 The boiling point of gry G Again - a crgofor means 5.06 mol of 78 requil for sapore'sytian 44 kJ heat it that Temp at which the 1 Again - rapor pressure as ligue become a equal to it a trospheorie pressure sine at high altitude the atoophonic Crater. frecrue is low s A is foorsitte so to that Vapor precree of egter may I of /mol ay carter, so for 5.8 ml became equal to a trooptearre pressen - a cogter heat required in even at low temp [eg 707 - 5.86 x 44 K Jule 19 2.15 = 2 (heut requif) 31.05X 33.9 = 4.32 KJ [ussy forwly for speatie heut) (heut required) = 2.15 I 3 105 4 -- 2:15 J x 31.05** 77.97 22 63.07 Jule (3 we know formaty molt - I 29.1 IT sequis fen raporisation af Iorol so heat requiel fer raporization of 33.9 mol = 39.1873.2 = 17:07 KFue