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goblinko [34]
3 years ago
12

Which of the following statements is not correct?

Chemistry
1 answer:
velikii [3]3 years ago
4 0
To answer the question above, multiply the given number of moles by the molar masses.

(A)     (0.20 mole) x (32 g / 1 mole) = 6.4 grams O2
(B)     (0.75 mole) x (62 g / 1 mole) = 46.5 grams H2CO3
(C)     (3.42 moles) x (28 g / 1 mole) = 95.7 grams CO
(D)     (4.1 moles) x (29.88 g / 1 mole) = 122.508 g Li2O

The answer to the question above is letter D.
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Communities is all the populations living in an ecosystem at the same time. A predator-prey relationship is an organism that eats another organism. 
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EastWind [94]

Answer:

Bird eating worm: The bird gains energy from eating its proteins.

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4NH3 + 502 --> 4NO + 6H20
gregori [183]

Answer:

5.52 g

Explanation:

  • 4NH₃ + 5O₂ → 4NO + 6H₂O

First we <u>convert the given masses of both reactants into moles</u>, using their <em>respective molar masses</em>:

  • 6.30 g NH₃ ÷ 17 g/mol = 0.370 mol NH₃
  • 1.80 g O₂ ÷ 32 g/mol = 0.056 mol O₂

Now we <u>calculate with how many NH₃ moles would 0.056 O₂ moles react</u>, using the<em> stoichiometric coefficients</em>:

  • 0.056 mol O₂ * \frac{4molNH_3}{5molO_2} = 0.045 mol NH₃

As there more NH₃ moles than required, NH₃ is the excess reactant.

Then we calculate how many NH₃ moles remained without reacting:

  • 0.370 mol NH₃ - 0.045 mol NH₃ = 0.325 mol NH₃

Finally we convert NH₃ moles into grams:

  • 0.325 mol NH₃ * 17 g/mol = 5.52 g
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The charge of the purple circles should be positive because they represent the nuclei.

Explanation:

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