HELP ASAP 1. When 3.00 L of propane at a temperature of 350 K and a pressure of 0.900 atm C3Hs(8), is completely combusted in excess oxygen gas (02) to form water
vapor (H20) and carbon dioxide gas (CO2), what mass of water vapor will result?
a. Balanced chemical equation
b. Ideal gas law problem-finding the moles of propane
C. Stoichiometry problem set up-finding the moles of water vapor
d. Finding the mass of water vapor za

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.

the answers would be

the first one and the second one

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.