You have to divide them by each other
Answer:
They have no solid surface.
Explanation:
Many outer planets are actually known as gas giants and don't contain much of a solid surface. hope this helped!
Explanation:
The chemical formula magnesium sulfide written as MgS and NOT
because charge on magnesium ion is +2 and charge on sulfide ion is -2.
Therefore, these charges will cancel out each other as we write the formula in simplest crisscross method.
Also, the numbers in a chemical formula display the total number of atoms attached with each other or central atom.
For example, in
there are two chlorine atoms attached to one calcium atom.
Therefore,
denotes one sulfur atom is attached to magnesium atom. Hence, we do not write the formula of magnesium sulfide as
because this shows two magnesium atoms are attached to two sulfur atoms which is not true.
Of what type of solutions
like any type
The given question is incomplete. the complete question is:
The world burns the fossil fuel equivalent of approximately
kg of petroleum per year. Assume that all of this petroleum is in the form of octane. Calculate how much CO2 in kilograms is produced by world fossil fuel combustion per year.( Hint: Begin by writing a balanced equation for the combustion of octane.)
Answer: 
Explanation:
Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

To calculate the moles :

According to stoichiometry :
As 2 moles of octane give = 16 moles of 
Thus
of octane give =
of 
Mass of 
Thus
of
is produced by world fossil fuel combustion per year.