An unknown substance has a mass of 56.8 g and a volume of 23.4 ml. what is the density of this unknown substance?

The density of unknown substance is 2.43 g/mL

Explanation:

Density is defined as the ratio of an object's mass and volume.

To calculate density of a substance, we use the equation:

We are given:

Mass of unknown substance = 56.8 g

Volume of unknown substance = 23.4 mL

Putting values in above equation, we get:

Hence, the density of unknown substance is 2.43 g/mL

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

answer7,570,82356 cubic centimeters;