a level chemistry

The heat released when 1.00 g of ethanol (Mr = 46.0) undergoes complete
combustion is 29.8 kJ
What is the heat released by each molecule, in joules, when ethanol undergoes
complete combustion?
(the Avogadro constant L = 6.022 × 1023 mol–1
)
A 2.28 × 10–18 J
B 4.95 × 10–20 J
C 2.28 × 10–21 J
D 4.95 × 10–23 J
can some explain how they got A.

Reply 1

bl0bf1sh

Original post by nnn121337

How many moles of ethanol are in 1 g?
The Avogadro constant L : there are 6.022 × 10^23 "units" in one mole of that substance.

See where you get from there :smile:

Reply 2

nnn121337

Original post by bl0bf1sh

How many moles of ethanol are in 1 g?
The Avogadro constant L : there are 6.022 × 10^23 "units" in one mole of that substance.

See where you get from there :smile:

there are 0.0217 moles so do you multiply be Avogadro constant thank you i understand now you divide 29800
by Avogadro constant multiple by the moles to give you the answer A.

Reply 3

bl0bf1sh

Original post by nnn121337

there are 0.0217 moles so do you multiply be Avogadro constant thank you i understand now you divide 29800
by Avogadro constant multiple by the moles to give you the answer A.