Quick

50 grams of propane, c₃h₈, reacts with 120 grams of oxygen. what is the limiting reagent?

a) c₃h₈
b) o₂
c) co₂
d) h₂o

Limiting reagent is

B) O₂

Explanation:

From the balanced reaction.

C3H8 + 5O2 ==> 3CO2 + 4H2O

there are two reagents(C3H8 and O2)and the limiting one is the one that is used up before the end of the reaction .

C3H8 : 02 = 1:5

Given mass 50g of propane

Molar mass = (3×12 + 8×1) =44g/mol

Mole= 50/44 = 1.136mol.

Given 120g of oxygen gas

Molar mass =32g/mol

Mole = 120/32= 3.75mol.

From the ratio, for the complete reaction, oxygen needs 5× of propane = 5×1.136= 5.68mol , but it has less (3.75mol)

Therefore O₂ is the limiting reagent.

answer; /// i do believe that the correct answer is (c)nuclear bond

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.