What is the enthalpy of fusion for naphthalene?
What is the enthalpy of fusion for naphthalene?
19.0 KJ mol
Given that the latent heat of fusion of naphthalene is `19.0 KJ mol^(-1)` and its melting point is `80.2^(@)C`.
What temperature does naphthalene sublimate?
around 80 °C
Naphthalene is a solid that sublimes at standard atmospheric temperature with the sublimation point at around 80 °C or 176 °F. At low temperature, its vapour pressure is high enough, 1 mmHg at 53 °C, to make the solid form of naphthalene evaporate into gas.
What is melting point of naphthalene?
80.26 °C
Naphthalene/Melting point
How do you determine the melting point of naphthalene?
Hold a thermometer with its bulb in the naphthalene. Use a small flame to heat the test-tube gently and watch the thermometer reading. To find the melting range, note the temperature when the naphthalene melts. Leave to cool and note the temperature when the naphthalene solidifies.
What is the effect of heat to naphthalene?
When heated at 80 °C, napthalene rapidly sublimes directly from a solid into a gas, eventually leaving nothing remaining in the crucible. On cool surfaces, the gaseous naphthalene will re-solidify to form needle-like crystals. This process is a method of purifying napthalene.
What is the boiling point and freezing point of naphthalene?
From Point F to G, naphthalene exists as liquid and solid. At Point H, naphthalene exists as solid. 2. The freezing point of naphthalene is 80.0 °C.
What will happen if naphthalene balls are heated?
As the naphthalene is heated, heat energy is converted to kinetic energy. Kinetic energy increases and the molecules vibrate faster about their fixed positions and the temperature increases. Naphthalene is in solid state at any temperature below its melting point. The particles can only vibrate at a fixed position.
What will happen if heat is given to naphthalene balls?
If heat is then added to naphthalene, it will melt until it reaches 80o C and it will stay at that temperature until melting is complete. This would be the melting point of naphthalene.
Is naphthalene poisonous to humans?
Inhalation of naphthalene may cause skin and eye irritation; gastrointestinal symptoms, such as nausea, vomiting, abdominal cramps, and diarrhea; neurologic symptoms, such as confusion, excitement, and convulsions; renal problems, such as acute renal shutdown; and hematologic features, such as icterus and severe anemia …
What are the side effects of mothballs?
Can naphthalene balls catch fire?
No, naphthalene mothballs are not flammable, but they are combustible, just like 1,4-dichlorobenzene mothballs are. They can catch fire but the flashpoint is above 100 degrees Fahrenheit. They are considered an explosive hazard when in vapor form.
What happens when you burn naphthalene?
In humans, naphthalene is broken down to alpha-naphthol, which is linked to the development of hemolytic anemia. Kidney and liver damage may also occur.
What is the triple point temperature of naphthalene?
Ttriple: Triple Point Temperature (K). Vc: Critical Volume (m 3 /kg-mol). 1: Molecular weight from the IUPAC atomic weights tables. Find more compounds similar to Naphthalene. Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data.
What happens to enthalpy in heat of fusion?
However, if the substance is transforming from a liquid state to a solid state the change in enthalpy (ΔH) is negative. This process is commonly known as the freezing, and results in the molecules within the substance becoming more ordered. Determining the heat of fusion is fairly straightforward.
What are the effects of exposure to naphthalene?
Naphthalene. Naphthalene is obtained from either coal tar or petroleum distillation and is primarily used to manufacture phthalic anhydride, but is also used in moth repellents. Exposure to naphthalene is associated with hemolytic anemia, damage to the liver and neurological system, cataracts and retinal hemorrhage.
What kind of fuel is naphthalene made of?
Naphthalene is a white solid that evaporates easily. Fuels such as petroleum and coal contain naphthalene. It is also called white tar, and tar camphor, and has been used in mothballs and moth flakes. Burning tobacco or wood produces naphthalene.
