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Veronika [31]
3 years ago
9

7. What is the mass in grams of 67mol of nitrogen dioxide. NO?

Chemistry
1 answer:
mash [69]3 years ago
7 0

Answer: 2.23 grams

Explanation:

Nitrogen dioxide is an oxide of nitrogen with a chemical formula of NO.

Given that:

mass in grams of NO = ?

Number of moles of NO = 67mol

Molar mass of nitrogen dioxide NO, use the atomic mass of nitrogen = 14g; Oxygen = 16g

NO = (14g + 16g) = 30g/mol

Now, apply the formula:

Number of moles = (Mass in grams / Molar mass)

67 moles = (Mass / 30g/mol)

Mass = (67moles/30g/mol)

Mass = 2.23 grams

Thus, there are 2.23 grams of Nitrogen dioxide present

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LenaWriter [7]
The right answer is A
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2 years ago
When nahco3 completely decomposes, it can follow this balanced chemical equation: 2nahco3 → na2co3 h2co3 determine the theoretic
BigorU [14]

Theoretical yield = 2.397

The product could be sodium carbonate

percent yield = 98.456%

When nahco3 completely decomposes, it can follow this balanced chemical equation:

2nahco3 → na2co3 h2co3

If the mass of the NaHCO3 sample is 3.80 g, we must use stoichiometry to calculate the theoretical yields of each of the products.

mass of NaHCO₃ = 3.80 g

molar mass of NaHCO₃ = 84 g/mol

so the no of moles of NaHCO₃ = 3.80/84 =  0.0452 mol

You see, one mole of sodium carbonate and one mole of hydrogen carbonate are produced from two moles of sodium bicarbonate.

so, the no of moles of sodium carbonate = 0.0452/2 = 0.0226 mol

∴ mass of sodium carbonate ( Na₂CO₃) = no of moles of Na₂CO₃ × molar mass of Na₂CO₃

=  0.0226 × 106 ≈ 2.397 g

no of moles of hydrogen carbonate = 0.0452/2 = 0.0226 mol

mass of the hydrogen carbonate ( H₂CO₃) = no of moles of H₂CO₃ × molar mass of H₂CO₃

= 0.0226 × 62 g = 1.401 g

mass of one of the products was measured to be 2.36 g , from above data, we can say it must be sodium carbonate because value is the nearest of 2.397 g.

percentage yield = experimental yield/theoretical yield × 100

here experimental yield of Na₂CO₃ = 2.36 g

and theoretical yield of Na₂CO₃ = 2.397 g

∴ % yield = 2.36/2.397 × 100 ≈ 98.456%

Therefore the percentage yield of the product is 98.456%

To learn more about percentage yield visit:

brainly.com/question/22257659

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