Asample of gas occupies 250 ml under laboratory conditions
of27oc and 740 mmhg pressure. what is the volume
atstandard temperature and pressure conditions?

Answer : The volume at standard temperature and pressure conditions is, 222 mL

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 740 mmHg

= final pressure of gas = 760 mmHg

= initial volume of gas = 250 mL

= final volume of gas = ?

= initial temperature of gas =

= final temperature of gas =

Now put all the given values in the above equation, we get:

Therefore, the volume at standard temperature and pressure conditions is, 222 mL

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l