Calculate the molarity (m) of a solution that contains 4.0 grams of koh and has a volume of 2.0 l.

The answer to your question is 0.036 M

Explanation:

Data

Molarity = ?

mass = 4.0 grams KOH

Volume = 2 L

Molecular mass KOH = 39 + 16 + 1 = 56 g

Formula

Process

1.- Calculate the moles of KOH using proportions

                       56 g of KOH ---------------- 1 mol

                         4  g of KOH ----------------  x

                         x = (4 x 1) / 56

                         x = 0.071 moles

2.- Substitute the values in the formula to find Molarity

3.- Simplification and result

       Molarity = 0.036 M

he would use the colour black

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.