2. How many moles of carbon dioxide are there in 1.34 x1021 molecules of CO,?

0.00223mol

Explanation:

The number of molecules of CO2 (nA) can be used to determine the number of moles it contain by dividing by Avagadros number (6.02 × 10^23 atoms)

That is;

number of moles (n) = nA of CO2 ÷ 6.02 × 10^23

According to this question, there are 1.34 x10^21 molecules of CO2, hence,

n of CO2 = 1.34 x10^21 ÷ 6.02 × 10^23

n = 1.34/6.02 × 10^21-23

n = 0.223 × 10^-2

n = 0.00223mol of CO2

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).