Answer:buckled railroad tracks on a hot day
Explanation: i just did it
To find average atomic mass, multiply each isotope's atomic mass with its relative abundance and add it all up.
15.012*0.1423 + 16.988*0.3348 + 19.177*0.5229 = 17.851 (5 s.f.)
Answer:
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
Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars. The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the Sun.
