Question

Use the data in the table below to answer the following questions:

Compound	ΔΔH°f (kJ/mol)
CH3NH2(l)	–23.0
O2(g)	0.0
CO2(g)	–393.5
NO2(g)	33.2
H2O(l)	–285.8

Methanol and methylamine are both combustible fuels. How many grams of methylamine must be combusted to raise the temperature of 457 g of water from 20.0°C to 53.0°C? Assume that the transfer of heat from the flame to the water is 100% efficient.

How many grams of carbon dioxide are produced in this combustion reaction?

Answer 1

4CH₃NH₂ (1) + 1302 4CO2 & 10t0 + 4NO₂ ДНуки A HA AH products reactants. Alhren - Attroducts – Alle reactants. A Horn = Sax (+393.5) + 10X(-285.8)+4x 33.3% - $4x (-23-of KJ A Horn = (-1574 – 2858 +132.8 + 92)KJ Ahnen = – 4207.2 K3. A Huan Permole = – 4207.2 – – 1051.8 kJ/mol 4 A Horn per gram = - 105118 kJ/mola - 105110 - -33.9347 Molar Mass 31 Now, Heat Required to raise the temporature of water. from 20°cto soci Q - in s AT 9.- 457 g *4,186 748 (53.00-20.0) = 63129 J = 63. 129 kJ Mass of CH₃NH₂ (in grams) required to supply required heat: 63.129 KJ 33,13 kJ/g = 1.861g of CH₂ MHz