Consider the following reaction: 2 C H 3 O H ( g ) ? 2 C H 4 ( g ) + O 2 ( g ) ?
ID: 788953 • Letter: C
Question
Consider the following reaction:
2CH3OH(g)?2CH4(g)+O2(g)?H=+252.8kJ
Consider the following reaction:
2CH3OH(g)?2CH4(g)+O2(g)?H=+252.8kJ
Calculate the amount of heat transferred when 29.0g of CH3OH(g) is decomposed by this reaction at constant pressure.
For a given sample of CH3OH, the enthalpy change during the reaction is 82.6kJ . How many grams of methane gas are produced?
How many kilojoules of heat are released when 38.1g of CH4(g) reacts completely with O2(g) to form CH3OH(g) at constant pressure?
Explanation / Answer
_____Enthalpy
_____CH3OH <----------> CO ___+___2H2_____dH = 90.7kJ
1) g H2 = MW H2 g/mole H2 * (2 H2 / 90.7kJ) * 18.0 kJ = ??
2) kJ released = (90.7 kJ/mole CO) * (29.0 g CO/ MW CO g/mole) = ??
3) kJ reqd = (90.7 kJ/mole CH3OH) * (47.0 g CH3OH / MW CH3OH g/mole CH3OH) = ??
Plug and SOLVE
Basic mathematics is a prerequisite to chemistry