Calculate the amount of heat needed to melt 160. g of solid octane (C8H18 ) and bring it to a temperature of 99.2 degrees c. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

The amount of heat needed to melt the given amount of octane is 84.6 kJ

Explanation:

We know:

Boiling point of Octane =

Few processes involved are:

(1):

(2):

Calculating the heat absorbed for the process having same temperature:

......(i)

where,

q is the amount of heat absorbed, n is the moles of sample and is the enthalpy of fusion

Calculating the heat released for the process having different temperature:

......(ii)

where,

n = moles of sample

= specific heat of liquid

are final and initial temperatures respectively

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

......(3)

Given mass of octane = 160. g

Molar mass of octane = 114.23 g/mol

Plugging values in equation 3:

For process 1:

We are given:

Putting values in equation (i), we get:

For process 2:

We are given:

Putting values in equation (ii), we get:

Calculating the total amount of heat released:

Hence, the amount of heat needed to melt the given amount of octane is 84.6 kJ

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na