47.7 g chunk of ice at -58 Celsius is heated until it completely melt find the total amount of heat in joules for this process to occur. What is the total amount of energy needed overall in kilojoules (three sig figs)

The total amount of energy needed overall in kilojoules is, 21.8

Explanation:

The conversions involved in this process are :

Now we have to calculate the enthalpy change.

where,

= enthalpy change = ?

m = mass of ice = 47.7 g = 0.0477 kg  (1kg=1000g)

= specific heat of solid water =

n = number of moles of water =

= enthalpy change for fusion = 6.01 kJ/mole

Now put all the given values in the above expression, we get

Therefore, the enthalpy change is, 21.8 kJ

they begin to vibrate harder causing the material that was solid to turn into a liquid i.e gallium or ice

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.