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ivann1987 [24]
3 years ago
7

Given the unbalanced reaction: P₄+ O₂

"\rightarrow" align="absmiddle" class="latex-formula"> P₄O₁₀ How many moles of O₂ are needed to produce 14.2 grams of P₄O₁₀­?
a. 0.125 mol
b. 0.0620 mol
c. 0.500 mol
d. 0.0500 mol
e. 0.250 mol
Chemistry
1 answer:
alex41 [277]3 years ago
6 0

Answer:

The correct answer is option e.

Explanation:

P_4+ 5O_2 \rightarrow P_4O_{10}

Moles of phosphorus pent-oxide :

\frac{14.2 g}{284 g/mol}=0.05 mol

According to reaction, 1 mole of phosphorus pent-oxide is obtained from 5 moles of oxygen gas.

Then 0.05 mole of  phosphorus pent-oxide will be obtained from:

\frac{5}{1}\times 0.05 mol=0.25 mol

Hence,the correct answer is option e.

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The mass of 2.75 mol K₂S is 303.24 grams.

  • Applying the mole concept:

      Number of moles(n) = given mass(m) / molar mass(M)

      n = m / M

  • Now applying the formula for the number of moles-

       i.e. number of moles of K₂S = mass of K₂S / Molas mass of K₂S

      As per question, Molar mass of K₂S, M = 110.27 g/mol

      and, number of moles of K₂S, n  = 2.75 moles

  • ∴ n = m / 110.27

        2.75 = m / 110.27

        m = 2.75 x 110.27

            = 303.24

     m    = 303.24 grams.

  Hence, the mass of 2.75 mol K₂S is 303.24 grams.

 To learn more about the mole concept, refer to:

  brainly.com/question/768852

  # SPJ2

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1. An element which are sonorous are called metal.

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