How many electrons are contained in the atom 6li?

3 electrons

Explanation:

Lithium is the third element of the periodic table, so its atomic number is 3:

Z = 3

This means that an atom of lithium contains 3 protons. Moreover, for a neutral atom the number of protons in the nucleus is equal to the number of electrons: this means that an atom of lithium contains 3 electrons as well.

In this specific case, we have an isotope of Lithium-6 (6Li), which has a mass number of 6:

A = 6

This means that the atom contains 6 protons+neutrons in the nucleus, so it contains 6-3 = 3 neutrons.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.