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2 years ago

What is the mass of 22.4 L of H2 at STP?

Chemistry

2 answers:

Vanyuwa [196]2 years ago

7 0

A. 1.01 is the right answer

Since

The formula is Pv= nRT

P=1 atm

V= 22.4 L

N= x

r= 0.0821

t = 273 k (bc it’s standard temperature)

So (1)(22.4)=(x)(0.0821)(273)

X= 1.001

Elanso [62]2 years ago

6 0

Answer: Option (b) is the correct answer.

Explanation:

STP means standard temperature and pressure. At this condition pressure is 1 atm, volume is 22.4 L and temperature is 298 K.

Therefore, using ideal gas equation we will calculate the number of moles as follows.

PV = nRT

$1 atm \times 22.4 L = n \times 0.0832 Latm K^{-1}mol^{-1} \times 298K$

n = 0.903 mol

= 1 mol (approx)

Hence, it is known that molar mass of hydrogen molecule is 2 g/mol. Therefore, calculate mass of $H_{2}$ at STP as follows.

Number of moles = $\frac{mass}{molar mass}$

1 mol = $\frac{mass}{2.02 g/mol}$

mass = 2.02 g

Thus, we can conclude that the mass of 22.4 L of H2 at STP is 2.02 grams.

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Explanation:

The chemical equation for the combustion of hydrocarbon having carbon, hydrogen and oxygen follows:

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We are given:

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For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

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To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon = $\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{2.47g}{12g/mole}=0.206moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{0.62g}{1g/mole}=0.62moles$

Moles of Oxygen = $\frac{\text{Given mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{3.29g}{16g/mole}=0.206moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.206 moles.

For Carbon = $\frac{0.206}{0.206}=1$

For Hydrogen = $\frac{0.62}{0.206}=3$

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Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H : O = 1 : 3 : 1

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The line is referred as an infinite set of joined points that extend indefinitely in one direction (from right to left, from north to south), so it has one dimension. The intersection of of two perpendicular walls is an example of what a line is.

Finally, the term to which the question is referred is the plane: an infinite set of joined points that extends in two dimensions. An example of plane is the surface of quite water. The plane does not have depth, only extension; that is why it has only two dimensions.

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