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4 years ago

8

The residue of coal decomposition that is used in the manufacture of steel is called: 1. coal gas 2. coke 3. coal tar

2 answers:

scoray [572]4 years ago

6 0

Answer: Option B

Explanation: The steel production is completely dependent on the coal or we can say the decomposition of the residual coal is used. The coaking coal is cleaned and the impurities are removed from the coaking coal which converts it into Coke.

The coke is then liquefied and softened into hard but porous lumps when it is heated in absence of air.

Then further processes are carried out in the furnace for the production of steel.

netineya [11]4 years ago

3 0

The residue of coal decomposition in the manufacture of steel is

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The standard molar enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the enthalpy change if 9.51 g N2(g) and 1.96 g H2(g)

Vladimir [108]

Answer:

$\Delta H=-29.7kJ$

Explanation:

Hello!

In this case, since the undergoing chemical reaction is:

$N_2+3H_2\rightarrow 2NH_3$

We first need to identify the limiting reactant given the masses of nitrogen and hydrogen:

$n_{NH_3}^{by\ H_2}=1.96gH_2*\frac{1molH_2}{2.02gH_2}*\frac{2molNH_3}{3molH_2}=0.647molNH_3\\\\ n_{NH_3}^{by\ N_2}=9.51gN_2*\frac{1molN_2}{28.02gN_2}*\frac{2molNH_3}{1molN_2}=0.679molNH_3$

It means that only 0.647 moles of ammonia are yielded, so the resulting enthalpy change is:

$\Delta H=0.647molNH_3*\frac{-45.9kJ}{1molNH_3}\\\\ \Delta H=-29.7kJ$

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3 years ago

How many grams in 82 moles of CO2

Tems11 [23]

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Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. Th

Zarrin [17]

Answer: 136 g of $NaN_3$ must be reacted to inflate an air bag to 70.6 L at STP.

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