Hom many Kj of heat released when 1 mo; of C2h2(g0 + 502(g) rightarrow 4co2(g) +

Question

Hom many Kj of heat released when 1 mo; of C2h2(g0 + 502(g) rightarrow 4co2(g) +2h2o(g) and endhalpy charging delta h = -2511 K how many Kj of heat are relasaed when I mol of c2H2 is burn ed in this flamer? -1255 KjA sample of gas has an initital volume of 10 L at a pressure of 1 atm . If the volume of the gas is incerss 20L, What is its pressure/ Consider the chemical reaction C (S) +H2o(g) rightarrow CO(G) +H9G) How many liters of hydrogen gas are formed from the complete reaction of 12 g c at STP? Lithium reacts with nitrogen gas according to the reaction

Explanation / Answer

Solution :

Given reaction

6 Li (s) + N2 (g) à 2 LI3N(s)

Given volume of N2 = 44.8 mL of N2

At STP 1 mol N2 = 22.4 L

Calculation of moles of N2

Mol N2 = 44.8 L x 1 mol N2 / 22.4 L = 2 mol N2

Moles of Lithium = moles of N2 x 6 mol Li / 1 mol N2

=12 mol Li(s)

Mass of Li = moles of Li x molar mass of Li

= 12 mol Li x 6.94 g/mol

=83.28 g Li

Mass of Li required = 83.28 g

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