For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, Δ U and w corresponds to

Question

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, Δ U and w corresponds to (A) Δ U<0, w=0 (B) Δ U<0, w<0 (C) Δ U>0, w=0 (D) Δ U>0, w>0

Tardigrade Admin · Accepted Answer

In bomb calorimeter, heat of combustion is determined at constant volume, hence heat of reaction corresponds to Δ U ∴ Δ U <0 W =0

Q. For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $Δ U$ and $w$ corresponds to

$Δ U < 0, w = 0$

$Δ U < 0, w < 0$

$Δ U > 0, w = 0$

$Δ U > 0, w > 0$

In bomb calorimeter, heat of combustion is determined at constant volume, hence heat of reaction corresponds to $Δ U$
$∴ Δ U < 0$
$W = 0$

Q. For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, ΔU and w corresponds to

ΔU<0,w=0

ΔU<0,w<0

ΔU>0,w=0

ΔU>0,w>0