How much energy is needed to melt 25.4 grams of l2

0.7824 KJ

Explanation:

Given data:

Mass of iodine = 25.4 g

Amount of heat required to melt = ?

Solution:

The heat of fusion of iodine is 7.824 Kj /mol

Number of moles of iodine = 25.4 g/ 254 g/mol

Number of moles of iodine = 0.1 mol

The amount of heat required to melt one mole of iodine is 7.824 Kj /mol

For 0.1 mol;

7.824 Kj /mol × 0.1 mol

0.7824 KJ

3 hours because it is a decent distance.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.