a Secure l mastering chemistry oorvmyct/itemview?assignmentProblemlDa 7713069 CH

Question

a Secure l mastering chemistry oorvmyct/itemview?assignmentProblemlDa 7713069 CHM 1142 General Chemistry I Spring 2017 TCAA chsHomeowas Heat Stoichiometry Part B +252.8 kJ calculate the amount of heat transferred when 29og of CHaoH(g) is decomposed by this reaction at constant pressure. Express your answer with the appropriate units. Value Units Submit My Answers Give Up Part C For a given sample of CH3OH, the enthalpy change during the reaction is 82 5 kJ How many grams of methane gas are pro Express your answer withthe appropriate units Value Units Submit My Answers Part D How many kilogoules of heat are released when 382 g of CH (g) reacts completely with On(g) to form CH3OH(g) at const Express your answer with the appropriate units.

Explanation / Answer

B)

find heat when m = 29 g of CH3OH is decmoposed

Mw of CH3OH = 32.04 g

moles of CH3OH = mass/MW = 29/32.04 = 0.9051 moles of CH3OH

note that the balance shows that

2 mol of CH3OH --> 252.8 kJ

so

0.9051 mol of CH3OH --> 0.9051*252.8/2 = 114.40464 kJ will be transferred

C)

if dE = 82.5 kJ

find mass of methanols

so

dH = 252.8 kJ per 2 mol

82.5/252.8*2 = 0.6526 moles

mass = mol*MW = 0.6526*32.04 = 20.909304 g of methanols were used

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