A rock weighing 75.0g is placed in a graduated cylinder displacing the volume from 31.4 ml to 36.5ml. What is the density of the rock in grams /cubic centimeter.

Explanation:

The density of a substance can be found by using the formula

volume = final volume of water - initial volume of water

volume = 36.5 - 31.4 = 5.1 mL

But

1 mL = 1 cm³

5.1 mL = 5.1 cm³

From the question we have

We have the final answer as

Hope this helps you

fe 55.85 g/mol and h2o 18.02 g/mol.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.