Answer the following questions about the chemical reaction C3H8(g) + 5 O2(g) à 3 CO2(g) + 4 H2O(g)

If 27.8 g of oxygen react, what mass of water was produced?

a
10.1 g
b
12.5 g
c
27.8 g

not clear

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.