10.0 grams of a gas occupies 12.5 liters at a pressure of 42.0 mm Hg. What is the volume when the pressure has increased to 75.0 mm Hg? 0.143 L 6.72 L 7.00 L 22.3 L

Answers

Answer 1

Answer:

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

V2 = P1 x V1 / P2

V2 = 42.0 x 12.5 / 75.0

V2 = 7.0 L

Answer 2

Answer:

Answer:

7.00 L

Explanation:

The only thing that varies between the two situations is pressure and volume.

we have the ideal gas equation

$PV=nrT$

We know that n = moles of substance remain constant, also the temperature and n corresponding to the ideal gas constant

Situation N1

$P_1= 42.0 mmHg\nV_1= 12.5 L \nP_1V_1=nrT$

Situation N2

$P_2= 75mmHg\nV_2= ?\nP_2V_2=nrT$

As nrT are equal both times, therefore we can match this term in both equations

$Ecuation N1\nP_1V_1=nrT\nEcuation N2\n P_2V_2=nrT\n$

We equate both equations

$P_2V_2=P_1V_1\nV_2=(P_1V_1)/(P_2)$

$V_2=(42mmHg.12.5 L)/(75.0 mmHg) \nV_2= 7.00L$

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Answers

Answer:F =MAX

Explanation:I did that

Answer:

F=MAX

Explanation:

I DID THAT TODAY AT 9:05AM FRIDAY 1/22/2021

Stoichiometry problems which give a known amount of one reactant and solve for an amount of product frequently state that there is "an excess" or "plenty" of the reactant(s) not given. (For example, in the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?) Why is it necessary to know that there is an excess of these reactant(s)?

Answers

Dumb. Can. Cabbage. Hn. D ikkk

In chemistry class, Allen determined the effectiveness of various metals in releasing hydrogen gas from hydrochloric acid. Several weeks later, Allen read that a utilities company was burying lead next to iron pipes to prevent rusting. Allen hypothesized that less rusting would occur with the more active metals. He placed the following into 4 separate beakers of water: (a) 1 iron nail, (b) 1 iron nail wrapped with an aluminum strip, (c) 1 iron nail wrapped with a magnesium strip, and (d) 1 iron nail wrapped with a lead strip. He used the same amount of water, equal amounts (mass) of the metals, and the same type of iron nails. At the end of 5 days, he rated the amount of rusting as small, moderate, or large. He also recorded the color of the water. What is the independent variable?a) the amount of water
b) the metals strips
c) amount of rust
d) hydrochloric acid

Answers

Answer:

b) the metals strips

Explanation:

In an experimental design, an independent variable is a variable that is changed or manipulated in a series of experiments. An independent variable is not dependent on any other variable in the experiment. The hypothesis for this experiment is stated to be: "If the chemical activity of the metallic wrapper is increased, then less rusting of iron will occur. The independent variable relates to the type of metal wrapping strip, and the dependent variables are the amount of rusting and color of the water.

How does evelyn hear music?

Answers

Who even is Evelyn?

The nucleus of an atom of K-42 contains(1) 19 protons and 23 neutrons
(2) 19 protons and 42 neutrons
(3) 20 protons and 19 neutrons
(4) 23 protons and 19 neutrons

Answers

The atomic number is the number of protons, while the atomic mass is the number of protons added to the number of neutrons. By definition, potassium (K) has atomic number 19, so it should have 19 protons. If it has a mass of 42, then the number of neutrons is 42 - 19 = 23 neutrons. This is choice (1).

Number of proton K => 19
therefore, 42 - 19 = 23.

So the answer is 19 protons and 23 neutrons.

Choose the system to which this item belongs: stomachexcretory
circulatory
endocrine
digestive
respiratory

Answers

Digestive. This also includes the intestines.

The stomach belongs to the digestive system, where your food goes to break down.

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