The volume of an unknown liquid is 15.0ml. the mass of the liquid and the graduated cylinder is 55.2g. if the mass of the graduated cylinder alone is 44.8g, what is the mass of the unknown liquid? round answer to 3 significant figures.

Mass of liquid unknown liquid =  10.4 g

Explanation:

Volume of liquid =  15 mL

Mass of liquid + graduated cylinder = 55.2 g

Mass of graduated cylinder = 44.8 g

Mass of unknown liquid = ?

Solution:

Mass of unknown liquid is calculated by subtracting the graduated cylinder mass from combined mass of liquid and graduated cylinder.

Mass of liquid = (Mass of liquid + graduated cylinder) - (Mass of graduated cylinder )

Mass of liquid =  55.2 g - 44.8 g

Mass of liquid =  10.4 g

So the mass of unknown liquid is 10.4 g.

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.