Physics High School

When 1.00g of hydrogen combines with 8.00g of oxygen, 9.00gof water is formed. During this chemical reaction, 2.86 × 10⁵J of energy is released.

(c) Explain whether the change in mass is likely to be detectable.

Answers

Answer 1

The change in mass during the chemical reaction is not likely to be detectable since it is extremely small compared to the initial masses of hydrogen and oxygen. The mass remains conserved during chemical reactions.

Given data:When 1.00g of hydrogen combines with 8.00g of oxygen, 9.00g of water is formed. During this chemical reaction, 2.86 × 105J of energy is released.(c) Explain whether the change in mass is likely to be detectable.During the chemical reaction, hydrogen combines with oxygen to form water molecule.

The mass of hydrogen is 1.00 g and that of oxygen is 8.00 g. The sum of the mass of hydrogen and oxygen = 1.00 g + 8.00 g = 9.00 gThe reaction product is water, whose mass is 9.00 g. Thus, the mass of the reaction product equals the sum of the masses of the reactants. Therefore, there is no change in mass.

Hence, the change in mass is not likely to be detectable during the chemical reaction.An explanation of this observation is provided by the law of conservation of mass. According to this law, the total mass of reactants is equal to the total mass of products. As the number of atoms is conserved during the chemical reaction, the mass of the reactants must be equal to the mass of the products. Thus, the mass remains conserved during chemical reactions.

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