General Chemistry Answers

Explain the observation made when each of the gases in mixed with

(a) bromine in a dark place

Complete combustion of 1 mol of hydrocarbon X requires exactly 8.5 mol of oxygen. 

Incomplete combustion of 1 mol of hydrocarbon X, to form carbon monoxide and water requires exactly 5.5 moles of oxygen.

How many hydrogen atoms are in one molecule of hydrocarbon X?

A)6

B)8

C)10

D)12

E)12

The answer is C) 10 but no idea why

Thanks

What is the edge length of a simple cubic unit cell made up of atoms having a radius

of 158 pm?

Calculate the standard entropy change for the following reaction:

Ca(OH)2(s) ⟶ CaO(s) + H2O(l)

Three 1.0 liter flasks are filled with H₂, O₂ and Ne, respectively, at STP. Which of the following statements

                       is true?

Three 1.0 liter flasks are filled with H₂, O₂ and Ne, respectively, at STP. Which of the following statements

                       is true?

A volume of 450 cubic centimeter is measured at a pressure of 740 mm Hg and a temperature of 25.4 oC.

What is the volume in liter? Pressure in pound per square inch and temperature in degree Kelvin?