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3 years ago

In a chemical reaction you collect 1000 mL of hydrogen gas at STP how many moles of hydrogen gas did you collect

2 answers:

8 0

Since there are 22.4 L/mol at STP, you would convert 1000mL to 1 L then divide that by 22.4, meaning your answer would be 0.0446 rounded to 0.04

mylen [45]3 years ago

4 0

Answer:

Option B = 0.04 mol

Explanation:

We were given the following:

Pressure = 1 atm (We know this because it was stated that the gas is at STP).

Volume = 1000ml = 1L (Converting to L by diving by 1000)

Temperature = 273.15k (We know this because it was stated that the gas is at STP).

We are to calculate the number of moles, n collected.

The Ideal Gas Equation relates all of these variables;

pV=nRT

where R = gas constant = 0.08206 L atm / K mol

making n subject of interest, we have;

n=pV / RT

Substituting the values of the variables and solving for n;

n = (1 * 1 ) / (0.08206 * 273.15)

n = 0.0446 mol

Approximately, n = 0.04 mol

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3 years ago

How do electrons transition between energy levels?

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3 years ago

1. What is the molarity of a solution prepared by dissolving 3.11 grams of NaOH in

Elena L [17]

The molarity of a solution prepared by dissolving 3.11 grams of NaOH in

enough water to make 300 milliliters of solution is 0. 256 mol/ L

Explanation:

<h3>What is Molarity?</h3>

Molarity (M) is the amount of a substance in a given volume of solution. It is otherwise known as the number of moles of solute in a certain amount of solution.

The unit of molarity is mol/L

<h3>Formula for calculating molarity :</h3>

Molarity = number of moles of solute divided by the volume of the solution\

<h3>Parameters </h3>

Molarity = ?

Number of moles is calculated using :

Mass of the solute = 3.11 grams of NaOH

Molar mass of the solute = Na + O + H

Let's input the atomic numbers of the elements: Na (23) , O (16) , H (1)

Molar mass of NaOH = 23 + 16 + 1 = 40 g/ mol

Number of moles = 3.11 ÷ 40 = 0.077 mol

Volume of the solution is measured in Liters

Let's convert 300 milliters to liters = 300 divided by 1000 = 0.3 Liters

Molarity = 0.077 ÷ 0.3 = 0. 256 mol/ L

Therefore, the Molarity of the solution is 0. 256 mol/ L

Read more on molarity here :

brainly.com/question/26873446

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1 year ago

You're at the zoo and have a big red 1.80 L helium balloon. The barometric pressure today is 785 mmHg. Then you hear the roar of

fomenos

Answer: The volume of the balloon up there is 6.192 L.

Explanation:

Given: $V_{1}$ = 1.80 L, $P_{1}$ = 785 mm Hg (mm Hg = 0.00131579) = 1.032 atm

$P_{2}$ = 0.300 atm, $V_{2}$ = ?

Formula used to calculate volume is as follows.

$P_{1}V_{1} = P_{2}V_{2}$

Substitute the value into above formula as follows.

$P_{1}V_{1} = P_{2}V_{2}\\1.032 atm \times 1.80 L = 0.300 atm \times V_{2}\\V_{2} = 6.192 L$

Thus, we can conclude that the volume of the balloon up there is 6.192 L.

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2 years ago

Identify the element with 3 energy levels and 2 valence electrons.

bixtya [17]

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3 years ago