Calculate the amount of co2 (in kg) released when 1 kg coal is burnt. assume that carbon content of the coal is 50% by mass. 4. calculate the co2 production in kg/mj if a coal fired power plant (efficiency - 30%) is used to produce electricity. assume energy density of coal - 24 mj/kg and assume the coal is

Explanation:

(a)   Here, the assumption is that complete combustion of carbon is taking place. This means that there is no CO formation

Reaction equation when carbon is burning is as follows.

Molar mass of C = 12 kg/kmol

Molar mass of = 44 kg/kmol

Hence, according to the stoichiometry,

1 Kmol of C reacted = 1 kmol of produced

Therefore, 12 kg of C reacted = 44 kg produced

It is given that coal contains 50 mass % Carbon

So, 1 kg of coal contains (0.50 × 1)kg Carbon

           Carbon in 1 kg Coal = 1 × 0.5 = 0.5 kg

As per the stoichiometry,

12 kg of C reacted = 44 kg produced

0.5 kg of C reacted = x kg produced

Therefore, value of x can be calculated as follows.

                    x =

                       = 1.83 kg

This means that amount of released is 1.83 kg.

(b)   It is assumed that coal contains 50 mass % carbon and 1 kg of coal burnt.

Since, it is given that energy density of coal is 24 Mj and efficiency of the power plant is 30%.

After burning 1 kg of coal amount of energy released = 24 Mj

Amount of energy converted to electricity = = 7.2 Mj

It is calculated that amount of released per 1 kg of coal = 1.83 kg

Therefore, calculate the amount of released in kg/Mj as follows.

        amount of released in kg/Mj =        

                        =

                        = 0.2541 kg/Mj

Hence, the production of in kg/MJ is 0.2541 kg/Mj.

astronomers such as edwin hubble.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.