The table shows the densities of Earth's layers. Layer

Which of these is most likely the density of Earth's mantle?

1.5-2.2 g/cm3

3.4-5.6 g/cm3

10.6-12.4 g/cm3

13.5-15.2 g/cm3

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.