Methanol (CH4O) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ---> CH4O(g)

1) How many molecules of hydrogen are needed to produce 25.O g of CH4O?

2) How many molecules of carbon monoxide are needed to produce 25.O g of CH4O?

3) How many molecules of hydrogen are needed to produce 50.0 g of CH4O?



Zinc and Nitric acid react to form zinc nitrate, ammonium nitrate, and water.

4Zn(s) + 10HNO3(aq) ---> 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l)

4) How many atoms of zinc react with 1.49 g HNO3?

5) Calculate the number of molecules of zinc that must react with an excess of HNO3 to form 29.1g NH4NO3.

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.

i think that the answer is c

answer: mole of the gas

answer: mole of the gasexplanation: