Answer:
Number of moles = 0.042 mol
Explanation:
Given data:
Number of moles = ?
Mass of calcium carbonate = ?
Solution:
Formula:
Number of moles = mass/ molar mass
now we will calculate the molar mass of calcium carbonate.
atomic mass of Ca = 40 amu
atomic mass of C = 12 amu
atomic mass of O = 16 amu
CaCO₃ = 40 + 12+ 3×16
CaCO₃ = 40 + 12+48
CaCO₃ = 100 g/mol
Now we will calculate the number of moles.
Number of moles = 4.15 g / 100 g/mol
Number of moles = 0.042 mol
Answer:
The right solution is:
(a) 2459.74 J/degree C
(b) 3271.769 KJ/moles
Explanation:
According to the question,
(a)
The heat capacity of the calorimeter will be:
= 
= 
= 
(b)
The change in temperature will be:
= 
= 
The amount of heat released will be:
= 
= 
or,
= 
Moles of benzene combusted will be:
= 
= 
hence,
The heat combustion for 1 mol of benzene will be:
= 
= 
Answer:
<h2>0.20 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula

volume = final volume of water - initial volume of water
volume = 75 - 50 = 25 mL
From the question we have

We have the final answer as
<h3>0.20 g/mL</h3>
Hope this helps you