Iron has a density of
7.86 g/c
m
3
(
1 c
m
3
=1 ml
). calculate the volume (in
dl
) of a piece of iron having a mass of 4.58
kg
. note that the density is provided in different units of volume and mass than the desired units of volume (
dl
) and the given units of mass (
kg
). you will need to express the density in
kg/dl
(
1 c
m
3
= 1 ml
) before calculating the volume for the piece of iron.

5.83 dL

Explanation: First convert the density to Kg/dL

Given Mass = 4.58 Kg

Given Density = 7.86 g/cm3 =7.86 g/mL

Density = 7.86 (g/mL) *100/1000(mL/g) Kg/dL

Density = 0.786 Kg/dL

From Density = Mass/Volume

Volume = Mass/Density

= 4.58/0.786 dL

=5.83 dL

what's the

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"