1. Balance the following equations:
a. -
C8H18(1) + ___02(g) +
CO2(g) +
H2O(1)

1. 2C8H18 + 25O2 —> 16CO2 + 18H2O

2. The coefficient of O2 is 25

Explanation:

C8H18 + O2 —> CO2 + H2O

The above equation can be balance as follow:

There are 8 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 8 in front of CO2 as shown below:

C8H18 + O2 —> 8CO2 + H2O

There are 18 atoms of H on the left side and 2 atoms on the right. It can be balance by putting 9 in front of H2O as shown below:

C8H18 + O2 —> 8CO2 + 9H2O

Now, there are a total of of 25 atoms of O on the right side and 2 atoms on the left side. It can be balance by putting 25/2 in front of O2 as shown below:

C8H18 + 25/2O2 —> 8CO2 + 9H2O

Multiply through by 2 to clear the fraction as shown below :

2C8H18 + 25O2 —> 16CO2 + 18H2O

Now the equation is balanced.

2. 2C8H18 + 25O2 —> 16CO2 + 18H2O

From the balanced equation above, the coefficient of O2 is 25

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.