Mass of object A = 10g
volume of object A = 8cm³
Mass of object B = 10g
Volume of Object B = 6cm³
we use the following formula to calculate the density of object A and B.
Density = Mass / Volume
Density of Object A = 10g / 8cm³ = 1.25g/cm³
Density of Object B = 10g / 6cm³ =1.67 g/cm³
So the density of object B is greater than object A
and if we find the difference:
1.67 - 1.25 = 0.42
So the answer is; Object B, by 0.42 gram per cubic centimeter
Answer:
b. - 184 J/K
Explanation:
- ΔSsurr = - ΔH/T....at constant P and T.
∴ ΔHrxn = 54.2 KJ = 54200 J
∴ T = 25°C ≅ 298.15 K
⇒ ΔSsurr = - (54200 J)/(298 K)
⇒ ΔSsurr = - 182 J/K ≅ - 184 J/K
The balanced chemical reaction is:
C6H6 + 9/2O2 = 6CO + 3H2O
We are given the amount of benzene to be used for the reaction. This will be the starting point for the calculations.
23.1 g C6H6 ( 1 mol C6H6 / 78.12 g C6H6 ) ( 6 mol CO / 1 mol C6H6 ) = 1.77 mol CO is produced from the reaction
Impure substance, because pure would be dirt from the earth