Markus was doing his chemistry homework and needed to find the number of electrons in an atom of carbon. He looked at his periodic table
and saw that it had an atomic mass of 12 and the atomic number was 6.
What should his answer be?

1869, the Russian chemist Dmitri Mendeleev came to prominence with his tabular ... He found that few of the new developments in the field of chemistry had made ... He corrected the known atomic masses of some elements and he used the ... Atomic number 101, Mendelevium, is named after the periodic table's architect

Explanation:

1869, the Russian chemist Dmitri Mendeleev came to prominence with his tabular ... He found that few of the new developments in the field of chemistry had made ... He corrected the known atomic masses of some elements and he used the ... Atomic number 101, Mendelevium, is named after the periodic table's architect

at  the temperature of the experiment is 0.56.

Explanation:

Moles of   = 0.35 mole

Moles of   = 0.40 mole

Volume of solution = 1.00 L

Initial concentration of =

Initial concentration of =

Equilibrium concentration of =

The given balanced equilibrium reaction is,

Initial conc.          0.35 M         0.40 M                  0 M        0M

    At eqm. conc.     (0.35-x) M   (0.40-x) M   (x) M      (x) M

Given:  (0.35-x) = 0.19

x= 0.16 M

The expression for equilibrium constant for this reaction will be,

Now put all the given values in this expression, we get :

Thus at  the temperature of the experiment is 0.56.