1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SCORPION-xisa [38]
3 years ago
12

Through the complete electrolysis of a sample of pure water, a student collects 14.0 grams of hydrogen gas and 112.0 grams of ox

ygen gas. What mass of water (in grams), if it reacted completely, was initially present? (The electrolysis of water is the use of an electric current to decompose it into its component elements.) Report your answer to the nearest tenth
Chemistry
1 answer:
Vadim26 [7]3 years ago
6 0

Answer:

126.0g of water were initially present

Explanation:

The electrolysis of water occurs as follows:

2H₂O(l) ⇄ 2H₂(g) + O₂(g)

<em>Where 2 moles of water produce 2 moles of hydrogen and 1 mole of oxygen.</em>

<em />

To find the mass of water we need to determine moles of oxygen and hydrogen, thus:

<em>Moles Hydrogen:</em>

14.0g H₂ ₓ (1mol / 2g H₂) = 7 moles H₂

<em>Moles Oxygen:</em>

112.0g O₂ ₓ (1mol / 32g) = 3.5 moles O₂

Based on the chemical equation, the moles of water initially present were 7 moles (That produce 7 moles H₂ and 3.5 moles O₂). The mass of 7 moles of H₂O is:

7 moles H₂O * (18g / mol) =

<h3>126.0g of water were initially present</h3>
You might be interested in
How is calculating a weighted average
kirza4 [7]

Answer:

The Key difference between average vs weighted average is that simple average is nothing but simply adding up all the observation values and dividing the same by the total number of observations to calculate the average whereas weighted average is an average where each observation value will have a frequency assigned.

Explanation:

8 0
3 years ago
A solid-solid solution is called a(n)
iren [92.7K]
  • DJ jgjjgjkhlhfCcf the today science and technology University admission test result ha ha ha ha ha ha ha ha ha ha kya rudra sharma at ma er ma er ma er kachei Alo is owned by the way
8 0
3 years ago
Read 2 more answers
Which property can be used to tell gold and pyrite apart?
zubka84 [21]

Answer:

D. Malleability

Explanation:

Gold is made up of the element Au and it is a metal.

Pyrite is iron sulfide and it is a non-metal.

  • They have very similar appearance to such an extent that pyrite is widely called the fool's gold.
  • To distinguish between the two, we simply explore their metallic properties.
  • Gold is malleable. Pyrite is not. It will crumble under pressure.
6 0
3 years ago
Name a food that contain an acid​
Triss [41]

Answer:

name a food that contain an acid

1. nuts

2. dairy

3. grains

3. meat

5 0
2 years ago
Read 2 more answers
Which characteristic can be inherited?
FinnZ [79.3K]

Answer:

long toes

Explanation:

the other traits are personality related, not a biological factor. they can be learned, but not inherited

6 0
2 years ago
Other questions:
  • Butane (C4H10) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50-liter container a
    15·1 answer
  • What is the body systems main job
    10·1 answer
  • Which intermolecular force is characteristic of compounds which are liquids at room temperature and have relatively high boiling
    9·1 answer
  • 35.67 g of NaNO3 is dissolved in water to make a 0.500 M solution. What is the volume of the solution in liters?
    9·1 answer
  • A liquid that occupies a volume of 9.0 L has a mass of 7.2 kg. What is the density of the liquid in kg/L
    13·1 answer
  • Myth: A dead organism is the same as a nonliving thing in science.<br><br> Fact:<br><br> Evidence:
    8·2 answers
  • 1. The density of solid Cu is 8.96g/cm3 . How many atoms are present per cubic centimeter(cm3) of Cu ?
    12·1 answer
  • The student inferred that a chemical reaction occurred what evidence supports this inference
    9·1 answer
  • What is defined as the basic unit in the metric system that describes a quality?
    12·1 answer
  • Noble gases have a blank balance she’ll with blank electrons. Because their balance she’ll is full they blank need to borrow or
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!