Question 11 (0.5 points) How many moles of NO2 are needed to react with 1.32 g H2? NO2 + H2 à NH3 + H20 ESPA

0.19 moles of NO₂ are needed.

Explanation:

Given data:

Mass of hydrogen = 1.32 g

Moles of NO₂ needed to react = ?

Solution:

Chemical equation:

2NO₂ + 7H₂   →     2NH₃+ 4H₂O

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 1.32 g/ 2 g/mol

Number o moles = 0.66 mol

Now we will compare the moles of hydrogen and nitrogen dioxide.

                H₂               :            NO₂

                 7                 :              2

              0.66              :           2/7×0.66 =0.19

0.19 moles of NO₂ are needed.

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.

c. is the answer

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