Answer: A
Explanation: Mass and volume is the amount, amount doesn’t make the phase of a matter change.
Answer:
c =0.2 J/g.°C
Explanation:
Given data:
Specific heat of material = ?
Mass of sample = 12 g
Heat absorbed = 48 J
Initial temperature = 20°C
Final temperature = 40°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 40°C -20°C
ΔT = 20°C
48 J = 12 g×c×20°C
48 J =240 g.°C×c
c = 48 J/240 g.°C
c =0.2 J/g.°C
<u>Answer:</u> The entropy change of the process is ![2.0\times 10^2J/K](https://tex.z-dn.net/?f=2.0%5Ctimes%2010%5E2J%2FK)
<u>Explanation:</u>
To calculate the entropy change for different phase at same temperature, we use the equation:
![\Delta S=n\times \frac{\Delta H_{f}}{T}](https://tex.z-dn.net/?f=%5CDelta%20S%3Dn%5Ctimes%20%5Cfrac%7B%5CDelta%20H_%7Bf%7D%7D%7BT%7D)
where,
= Entropy change
n = moles of acetone = 6.3 moles
= enthalpy of fusion = 5.7 kJ/mol = 5700 J/mol (Conversion factor: 1 kJ = 1000 J)
T = temperature of the system = ![-94.7^oC=[273-94.7]=178.3K](https://tex.z-dn.net/?f=-94.7%5EoC%3D%5B273-94.7%5D%3D178.3K)
Putting values in above equation, we get:
![\Delta S=\frac{6.3mol\times 5700J/mol}{178.3K}\\\\\Delta S=201.4J/K=2.0\times 10^2J/K](https://tex.z-dn.net/?f=%5CDelta%20S%3D%5Cfrac%7B6.3mol%5Ctimes%205700J%2Fmol%7D%7B178.3K%7D%5C%5C%5C%5C%5CDelta%20S%3D201.4J%2FK%3D2.0%5Ctimes%2010%5E2J%2FK)
Hence, the entropy change of the process is ![2.0\times 10^2J/K](https://tex.z-dn.net/?f=2.0%5Ctimes%2010%5E2J%2FK)
Answer:
A carbon–oxygen bond is a polar convalescent bond between carbon and oxygen. Oxygen has 6 valence electrons and prefers to either share two electrons in bonding with carbon, leaving the 4 nonbinding electrons in 2 lone pairs :O: or to share two pairs of electrons to form the carbon functional group.
Answer:
1)magnesium nitrate +hydrogen
2)calcium chlorine+hydrogen
3)zinc sulfate +hydrogen
Explanation:
hope it helps