How many moles of aluminum sulfate are required to create 200 l of 3 m solution

600 moles of (NH₄)₂SO₄ are required

Explanation:

If concentration is in m, this means molality.

Molality is reffered to the moles of solute, in 1 kg of solvent.

Volume of solvent = 200L

If we use density, we assume that solvent is water so:

1 g/mL = solvent mass / solvent volume

200L . 1000 = 2x10⁵ mL

1g/mL = solvent mass / 2x10⁵ mL

200000 g = solvent mass

In 1kg of water we have 3 m

In 200 kg of water we have (200 . 3)/1 =  600 moles

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.

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explanation: