According to the following reaction, how much energy is evolved during the reaction of 32.5 g B2H6 with excess Cl2? The molar mass of B2H6 is 27.67 g/mol. B2H6(g) + 6 Cl2(g) → 2 BCl3(g) + 6 HCl(g) ΔH°rxn = -1396 kJ

1640.3 kJ of energy is released

Explanation:

Step 1: data given

Mass of B2H6 = 32.5 grams

Cl2 = in excess

The molar mass of B2H6 is 27.67 g/mol.

ΔH°rxn = -1396 kJ

Step 2: The balanced equation

B2H6(g) + 6 Cl2(g) → 2 BCl3(g) + 6 HCl(g)   -1396 kJ

This means when 1 mol of B2H6 reacts with 6 moles of Cl2 there will 1396 kJ of energy be released

Step 3: Calculate the moles of B2H6

Moles B2H6 = mass B2H6 / molar mass B2H6

Moles B2H6 = 32.5 grams / 27.67 g/mol

Moles B2H6 = 1.175 moles

Step 4: Define the limiting reactant

Since Cl2 is in excess, B2H6 will be the limiting reactant.

For 1 mol B2H6 we need 6 moles Cl2 to produce  2 moles BCl3 an 6 moles HCl

For this reaction 1396 kJ of energy will be given off

For 1.175 moles B2H6 the amount of energy released will be:

1.175 * 1396 = 1640.3 kJ

1640.3 kJ of energy is released

NOTE: the negative sign in the question show the energy is released

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.