Chemistry, 18.09.2019 00:00 ashlynmartinezoz2eys

How many grams of oxygen are formed when 58.6 g of kno3 decomposes?

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The formula for potassium nitrate is: 2KNO₃ → 2KNO₂ + O₂

If moles = mass ÷ molar mass

then moles of KNO₃  = 58.6 g ÷ [( 39 × 1 ) + ( 14 × 1) + ( 16 × 3)] g/mol

= 58.6 g ÷ ( 101 g ) g/mol

= 0.5802 mol

Now the mole ratio of KNO₃ : O₂ is 2 : 1

∴ if moles of  KNO₃ = 0.5802 mol

  then moles of O₂ =  0.5802 mol ÷ 2

= 0.2901 mol

Now since mass = moles × molar mass

∴ the mass of oxygen produced = 0.2901 mol × ( 16 × 2) g/mol

= 9.283 g

∴ the grams of oxygen gas produced when 58.6 grams of potassium nitrate is decomposed is ~ 9.28 g

Answer from: Quest

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.