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iragen [17]
4 years ago
10

Question 1 (5 points)

Chemistry
1 answer:
labwork [276]4 years ago
8 0

Answer:

The volume of ammonia produced by 4.2 L of hydrogen and excess nitrogen is 2.8 L.

Explanation:

Given data:

Volume of H₂ = 4.2 L

Volume of NH₃ produced = ?

Solution:

First of all we will write the balance chemical equation:

N₂ + 3H₂    →   2NH₃

Hydrogen is limiting reactant and volume ratio is,

                         H₂           :       NH₃

                         3             :         2

                         4.2         :           2/3 × 4.2 =  2.8 L

The volume of ammonia produced by 4.2 L of hydrogen and excess nitrogen is 2.8 L.

                         

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Sarah measures out 151 grams of SO2. How many moles is this? Express your answer to three significant figures.
Anna11 [10]

Answer:

\boxed {\boxed {\sf 2.36 \ mol \ SO_2}}

Explanation:

We are asked to convert grams to moles. We will use the molar mass and dimensional analysis to perform this conversion.

<h3>1. Molar Mass</h3>

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equivalent to the atomic masses, but the units are grams per mole instead.

We are given a mass of sulfur dioxide (SO₂). Look up the molar masses of the individual elements.

  • Sulfur (S): 32.07 g/mol
  • Oxygen (O): 15.999 g/mol

Notice that the formula of the compound contains a subscript. The subscript after O means there are 2 moles of oxygen in 1 mole of sulfur dioxide. We must multiply oxygen's molar mass before adding sulfur's.

  • O₂: 15.999 * 2 = 31.998 g/mol
  • SO₂= 32.07 + 31.998 = 64.068 g/mol

<h3>2. Convert Grams to Moles </h3>

Now we will use dimensional analysis to convert grams to moles. From the molar mass, we know there are 64.068 grams of sulfur dioxide per mole, so we can set up a ratio.

\frac {64.068 \ g \ SO_2} {1 \ mol \ SO_2}

We are converting 151 grams to moles, so we multiply by this value.

151 \ g \ SO_2 *\frac {64.068 \ g \ SO_2} {1 \ mol \ SO_2}

Flip the ratio so the units of grams of sulfur dioxide cancel.

151 \ g \ SO_2 *\frac {1 \ mol \ SO_2}{64.068 \ g \ SO_2}

151  *\frac {1 \ mol \ SO_2}{64.068 }

\frac {151}{64.068 } \ mol \ SO_2

2.356870825 \ mol \ SO_2

<h3>3. Round </h3>

The original measurement of grams (151) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 6 in the thousandth place tells us to round the 5 in the hundredth up to a 6.

2.36 \ mol \ SO_2

151 grams of sulfur dioxide is approximately <u>2.36 moles of sulfur dioxide.</u>

8 0
3 years ago
Please choose one of the choices
Georgia [21]

Answer:

A. the law of constant composition

Explanation:

The molecules in the container would have the same composition because they would have traded around atoms until an equilibrium was reached with every molecule having 1 Hydrogen and 1 Chlorine.

7 0
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