What two factors are used to determine the frequency of waves

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h