Calculate the number of coulombs of positive charge in 263 cm3 of (neutral) water. (hint: a hydrogen atom contains one proton; an oxygen atom contains eight protons.)

Since, hydrogen atom consist of one proton and an oxygen atom consist of eight protons.

Now, density of water is 1 g/ml

Given volume = = 263 mL

So, weight of water = 263 g

Number of moles of water =

=

= 14.61 g/mol

Number of protons =

=  

As, charge on one proton =

Thus, total charge =

=

=  

Thus, is the total number of coulombs of positive charge.

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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.