Mass of Mg(s) 0.31 g
Initial temperature of calorimeter23.6
contents
°C
Final temperature of calorimeter 36.8
contents
°C
Volume of calorimeter
100mL
Use the calorimeter data for the combustion of magnesium
to determine the molar enthalpy of reaction (in kJ/mol) for
magnesium. Input your 3 digit answer with no spaces or
commas. Record this value for use in subsequent
questions.

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.

how important do you think an instrument is to the musician who plays it?