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True [87]
2 years ago
11

How many moles of hydrogen gas would be required to produce 25 moles of H2O?

Chemistry
1 answer:
OverLord2011 [107]2 years ago
5 0

Answer:

There would be 25 moles

Explanation:

This is the equation for water (synthesis):

2H₂   +   O₂   →    2H₂O

Since there are 25 moles of water, the moles of hydrogen gas will have 25 moles.

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How many grams of sodium hydroxide are needed to make 250. Ml of a 7.80 m solution?
sashaice [31]
<h3><u>Answer;</u></h3>

= 78 g of NaOH

<h3><u>Explanation;</u></h3>

Concentration = Moles of solute/Volume of solution

Thus;

Moles of the solute = Volume × Concentration

                                = 7.80 Moles/L × 0.250 L

                                 = 1.95 moles

But; 1 mole of NaOH = 40.0 g

Thus;

Mass of NaOH = moles × molar mass

                         = 1.95 moles × 40 g/mole

                        <u> = 78 g of NaOH</u>

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3 years ago
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Slime is made of glue, water, and borax

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3 years ago
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Which half-reaction is most easily reduced? Al3+ + 3e- Al = -1.66 V Cu2+ + 2e- Cu = 0.34 V Fe3+ + e- Fe2+ = 0.77 V Na+ + e- Na =
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<span />The answer is <span>Fe3+ + e- Fe2+ =</span>
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How many grams of al2o3 (mm = 101. 96 g/mol) are produced when 91. 7 grams o2 reacts with excess aluminum?
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Answer:

Explanation:

1. Write down the balanced equation

2. Use molar mass of O2 (32g/mol) divided by the given mass to derive the amount of mols

3. multiply the answer by 2/3 (divide by 3 then multiply by 2), to ensure the mols are in correct proportion

4. Use given molar mass and multiply it by the amount

5. Make sure to use proper significant digits (3 in this case) and units :)

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2 years ago
A graduated cylinder initially has 32.5 mL of water in it. After a 75.0 g piece of lead (Pb) is added to the graduated cylinder,
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Answer:

39.1-32.5 and you will find your answer it always like that, you subtract your starting point from your ending point

Explanation:

6 0
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