please explain step by step process Consider the following reaction. Fe,o, Fe 30

Question

please explain step by step process

Consider the following reaction. Fe,o, Fe 30 AH 824.2 kJ mol The formation of 69.0 g of O2 results in O the release of 1.90 x10 kJ of heat. O the absorption of 1780 kJ of heat. O the release of 1780 kJ of heat. O the absorption of 592 kJ of heat. O the release of 592 kJ of heat. O the absorption of 1.90 x 10 kJ of heat. Question 9 of 16 sapling learning heat of combustion for a specific compound is -1440.0 kJumol and its molar mass is 44.63 g/mol, how many grams of this compound must you burn to release 270.80 kJ of heat? Number Question 10 of 16 University Science Books

Explanation / Answer

if 69 g of O2 react

we need to change this to mol, since we have all in mol basis

mol = mass/molar weight

MW = 32 g/mol

then

mol of O2 = mass/MW = 69/32 = 2.15625 mol of O2

the basis of the reaction is for a formation of 3 mol of O2; not 2.15625

therefore

HRxn = 824.2 kJ/ 3mol of O2 * 2.15625 mol of O2

Hrxn = (824.2)/3* 2.15625 = 590.6766 kJ nearest value is 592 kJ

since Hrxn is positive, this means it is endothermic, meaning it ABSORBS energy

answers:

"the absorption of 592 kJ of heat"

2)

if

q = -1440 kJ/mol

and MW = 44.63 g/mol

how many grams are needed to produce 270.8 kJ

first, identify Q by mass

Q = -1440 kJ/mol * 1mol / 44.63 g = 32.2652 kJ/g

since we nee only 270.8

then

mass = Q/hrxn =270.8 / 32.2652 = 8.39294 g of substance is required

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