What is the density of an object having a mass of 4.000 g and a volume of 39.0 cubic centimeters?

The answer is

Explanation:

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

From the question

mass = 4 g

volume = 39.0 mL

The density is

We have the final answer as

Hope this helps you

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the answer is d.) potassium