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soldier1979 [14.2K]
2 years ago
7

Short Response

Chemistry
1 answer:
Natalija [7]2 years ago
8 0

Answer:

6.)

7.)  134.4 g O₂

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ---> N₂ (g) + H₂O (g) + energy

<u>Reactants</u>: 1 nitrogen, 3 hydrogen, 2 oxygen

<u>Products</u>: 2 nitrogen, 2 hydrogen, 1 oxygen

The balanced equation:

4 NH₃ (g) + 3 O₂ (g) ---> 2 N₂ (g) + 6 H₂O (g) + energy

<u>Reactants</u>: 4 nitrogen, 12 hydrogen, 6 oxygen

<u>Products</u>: 4 nitrogen, 12 hydrogen, 6 oxygen

To convert from moles to grams, you need to multiply the starting value (4.2 moles) by the molar mass (32.00 g/mol). The molar mass can serve as a conversion because it technically means there are 32.00 grams O₂ per every 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator).

4.2 moles O₂          32.00 g
--------------------  x  ----------------  =  134.4 g O₂
                                1 mole

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A 25.0-mL sample containing Cu2+ gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.027
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Answer:

The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.

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n = 1.375x10⁻⁵ mol

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