Chemistry, 11.07.2021 02:40 omar1511

the pressure on a 205 mL volume of gas is decreased from 985 mm hg to 615 mm hg while constant temperature is maintained, What is the new volume of the gas?

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Answer from: washingtonwhitney995

$\boxed {\boxed {\sf 328 \ mL}}$

Explanation:

The pressure on the gas changes, while the temperature remains constant, and we want to find the new volume. So, we will use Boyle's Law, which states there is an inverse relationship between the pressure on a gas and the volume of the gas. The formula is:

${P_1V_1}= P_2V_2$

The pressure of the gas is originally 985 mm Hg and the volume is 205 milliliters.

$985 \ mm \ Hg * 205 \ mL = P_2V_2$

The pressure is decreased to 615 mm Hg, but the new volume is unknown.

$985 \ mm \ Hg * 205 \ mL = 615 \ mm \ Hg * V_2$

We are solving for the new volume, so we must isolate the variable V₂. It is being multiplied by 615 millimeters of mercury.. The inverse of multiplication is division, so we divide both sides of the equation by 615 mm Hg.

$\frac {985 \ mm \ Hg * 205 \ mL}{615 \ mm \ Hg} = \frac{615 \ mm \ Hg * V_2}{615 \ mm \ Hg}$

$\frac {985 \ mm \ Hg * 205 \ mL}{615 \ mm \ Hg} = V_2$

The units of millimeters of mercury (mm Hg) cancel.

$\frac {985 \ * 205 \ mL}{615 } = V_2$

$\frac{201925 }{ 615} \ mL = V_2$

$328.3333333 \ mL = V_2$

The original measurements have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.

The 3 to the right in the tenths place tells us to leave the 8 in the ones place.

$328 \ mL \approx V_2$

The new volume of the gas is approximately 328 milliliters.

Answer from: Quest

Bthe s the

Answer from: Quest

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different. let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones). now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first. for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours. so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.