# Which of the following variables does Gay-Lussac's Law focus on? I. pressure II. volume III. temperature IV. amount of gasa. I and III b. II and III c. III and IV d. II and IV

jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted on

Gay Lussac found two laws related to gasses.

Law 1

The ratio between the volumes of the reactant gases and the products can be expressed in simple whole numbers.

Law 2

The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas' absolute temperature.

It seems the question is based on law 2. Here mass and volume is constant and the pressure and temperature changes.

So the answers are pressure and temperature.

Sources:

sanjeetmanna | College Teacher | (Level 3) Assistant Educator

Posted on

Gay-Lussac's Law it is the combination of boyles law and charles law.

According to Boyles law at constant temperature,

pressure is inversely propositional to volume that is with increase in pressure volume decreases and vice versa.

`P prop 1/V`

`PV = K`

`P_1V_1 = P_2V_2`

According to Charles law at constant pressure,

volume is directly propositional to temperature that is with increase in temperature volume increases and vice versa...

`V prop T`

`V/T = K`

`(V_1)/(T_1) = (V_2)/(T_2)`

According to Gay-Lussac's Law at constant volume,

pressure is directly propositional to temperature that is with increase in temperature pressure increases and vice versa...

`P prop T`

`P/T = K`

`(P_1)/(T_1) = (P_2)/(T_2)`

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Therefore answer is Option (a) siince Gay-Lussac's Law deals with pressure and temperature.

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jjrichardson | Student, College Freshman | (Level 1) Valedictorian

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Gay-Lussac, Joseph Louis (1778-1850), a French chemist and physicist. The formulation of Gay-Lussac's Law (1808) was an important step toward the discovery of fundamental properties of gases. Gay-Lussac had also independently discovered Charles' Law in 1802. In 1804 he ascended to 23,000 feet (7,000 m) in a balloon, to study the effect of magnetism in the upper atmosphere. In 1808 Gay-Lussac, working with Louis Jacques Thenard, isolated boron. Gay-Lussac discovered cyanogen in 1809. In 1815 he proved that prussic acid contains hydrogen and not oxygen. This completed the downfall of Lavoisier's theory that all acids contain oxygen. Gay-Lussac attended the cole Polytechnique in Paris, 1797-1800, and was made a professor of chemistry at the school in 1809. He was also a professor at the Sorbonne, 1808-32, and at the Botanical Garden after 1832. He was made a member of the French Academy in 1806 and was elected to the Chamber of Deputies in 1831. Gay-Lussac's Law states: When gases combine, their relative combining volumes and the volume of the product, if it is a gas, can be expressed by small, whole numbers. This law led directly to the formulation of Avogadro's Law.