When butane burns in oxygen, it produces carbon dioxide and water. this reaction is represented in this equation 2c4h10 + 13o2 → 8co2 + 10h2o

There are 8atoms of carbon, 26atoms of oxygen and 20atoms of hydrogen at both sides of the equation.

Explanation:

The chemical equation 2C4H10 + 13O2 → 8CO2 + 10H2O is balanced because there are 8atoms of carbon, 26atoms of oxygen and 20atoms of hydrogen at both sides of the equation.

If we look at the reactants, you will see we have 2moles of butane and butane contains 4atoms of carbon and 10 moles of hydrogen.

To get the total moles of each element, we will multiple 2moles of that compound (butane) by each elements present in butane i.e hydrogen and carbon to make hydrogen (2×10)moles i.e 20moles and carbon (2×4)moles i.e 8moles.

Similarly for oxygen, we have 13moles of oxygen atom to make(2×13)moles i.e 26moles.

Note that for a chemical equation to be balanced, the number of moles of each elements at both sides must be the same.

be subject to a force andchange its motion

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards