The loudness of a sound, in decibels (dB), is given by 10log where is the lo
intensity of the sound (measured in watts per square meter), and lo is 10-12 watts
per square meter. If the intensity of a lawn mower is typically 10-3 watts per square
meter, what is its loudness in decibels?

Step-by-step explanation:

Balance the following equation:    C3H8    +    O2    > CO2      +     H2O. (There will be no need for state symbols.)

First of all, to balance these equations, list the number of each atom, for both sides of the equation. In this example, it would be:

Carbon: 3                                                        Carbon: 1

Hydrogen: 8                                                    Hydrogen: 2

Oxygen: 2                                                       Oxygen: 3

The first step would be to balance out the carbons on the products side by multiplying CO2 by 3. The new equation will be

C3H8 + 02 > 3CO2 + H20