A 7.11g sample of potassium chlorate was decomposed according to the following equation: 2KCLO3 -->2KCL + 3O2 How many moles of oxygen are formed?

A 7.11g sample of potassium chlorate was decomposed according to the following equation: 2KCLO3 -->2KCL + 3O2, the moles of oxygen are formed - 0.0870

Given:

sample of potassium chlorate =  7.11g

reaction:

2KClO₃ -->2KCl + 3O₂

This means 2 moles of KClO₃ produces 2 moles of KCl and 3 moles of O₂

Solution:

KClO₃ = (1 x 39.1) + (1 x 35.45) + (3 x 16)  

          = 39.1 + 35.45 + 48  

          = 122.55 g

So, 1 mole of KClO₃ = 122.55 g

Then, 7.11 g of KClO₃

=

= 0.0580 moles

We know,

2 moles of KClO₃ = 3 moles of O₂

Then,

0.0580 moles of KClO₃ = × 0.0580 moles

= 0.0870 moles of oxygen

Thus, In this reaction, the moles of oxygen are formed - 0.0870.

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The answer to your question is 0.087 moles of Oxygen

Explanation:

Data

mass of KClO₃ = 7.11 g

moles of O₂ = ?

Balanced chemical reaction

               2KClO₃  ⇒   2KCl  +  3O₂

Process

1.- Calculate the molar mass of KClO₃

KClO₃ = (1 x 39.1) + (1 x 35.45) + (3 x 16)

           = 39.1 + 35.45 + 48

           = 122.55 g

2.- Convert the mass to KClO₃ to moles

                  122.55 g 1 mol

                      7.11 g    x

                       x = (7.11 x 1)/122.55

                       x = 0.058 moles

3.- Calculate the moles of Oxygen

                  2 moles of KClO₃ 3 moles of Oxygen

                  0.058 moles          x

                  x = (0.058 x 3) / 2

                  x = 0.087 moles of Oxygen

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.