Convert 2.4 X 10^28 Molecules of H3PO4 into Grams.

3906966 g

Explanation:

The number of molecules contained in a substance is given by the formula:

number of molecules = number of mole * Avogadro constant.

Given that:

number of molecules = 2.4 * 10²⁸ molecules, Avogadro constant = 6.02 * 10²³ mol⁻¹.

Substituting gives:

2.4 * 10²⁸ molecules = number of moles * 6.02 * 10²³ mol⁻¹

number of moles =  2.4 * 10²⁸ molecules / 6.02 * 10²³ mol⁻¹

number of moles = 39867 moles

The molar mass of H₃PO₄ = (1 * 3) + (31 * 1) + (16 * 4) = 98 g/mol

Hence:

mass of H₃PO₄ = molar mass of H₃PO₄ * number of moles

mass of H₃PO₄ = 98 g/mol * 39867 moles

mass of H₃PO₄ = 3906966 g

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.