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
Nataly [62]
3 years ago
13

According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 488 kJ of energy?

Chemistry
1 answer:
vladimir1956 [14]3 years ago
7 0

Answer:

m = 95.47 g

Explanation:

The reaction is missing. I found it, and here's the missing part:

SiO2(s) + 4HF(s) -> SiF4(s) + 2H2O(l)        ΔH°rxn = -184 kJ

According to the reaction, 2 moles of water are produced in this reaction, and this also produces 488 kJ of energy.

To calculate the mass of any compound we use the expression:

m = n*MM

The molar mass of water is 18 g/mol. so, we need the moles of water to get the mass. The relation between the heat and energy is the following:

ΔH = Q/n ---> solving for n:

n = Q/ΔH.

So, let's calculate moles of water used here:

n = 488 * 2/184

n = 5.304 moles

Now we can calculate the mass:

m = 5.304 * 18

m = 95.47 g

You might be interested in
An example of two class b fuels would be
Viefleur [7K]
Flammable liquid,gasoline, oil, and etc
6 0
3 years ago
Which of the following is an SI base unit for measuring length?
Nikolay [14]
An SI base unit for measuring length would be meters.
5 0
3 years ago
Why were colonists in new england angry at king james 2 abd governor edmund andros of new england?​
Pani-rosa [81]

His strict imposition of autocratic rule was supported by his appointment by the King, who otherwise was not directly involved.

Explanation:

Andros’ imposition of Episcopalian worship in the Old South Meeting house, Boston his vigorous enforcement of the Navigation Acts.

He had earned the enmity of the local populace by enforcing the restrictive Navigation Acts.

He had infuriated Puritans in Boston by promoting the Church of England, which was rejected by many Nonconformist New England colonists.

When news of the overthrow of James II (1688) reached Boston, the colonists revolted, deposing Andros and imprisoning him.

His requirement that landholders take out new land patents and his limitations upon town meetings and rights of local taxation all aroused sharp resentment in colonial America.

7 0
3 years ago
Which of the following statements is correct regarding the speed and velocity of an object? A. An object’s speed is determined b
Natalija [7]

Answer:

Explanation:

D

4 0
3 years ago
Why do deep earthquake do less damage then shallow ones ?
Nata [24]
Shallow ones are seismic waves from deep quakes that have to travel farther to the surface, losing energy along the way. shaking is more intense from quakes that hit close to the surface.
5 0
3 years ago
Other questions:
  • Calculate the pH of a buffer solution prepared by mixing 60.0 mL of 1.00 M lactic acid and 25.0 mL of 1.00 M sodium lactate.
    8·1 answer
  • How many grams of CO are needed with an excess of Fe2O3 to produce 35.0 g Fe?
    15·1 answer
  • What is the change of state involved in combustion of an alcohol and it’s entropy ?
    14·1 answer
  • 3 A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.
    5·1 answer
  • To receive traits from an ancestor _ _ _ _ _ _ _
    12·1 answer
  • This is a question in Seneca, plz help asap bc I can't skip it!!
    5·1 answer
  • Which statement best describes a solution? A). a mixture consisting of minute particles suspended in a medium that start moving
    14·1 answer
  • Which type of stoichiometry problems does not require the use of molar mass?
    8·1 answer
  • Most terrestrial plants are members of this Division:
    10·2 answers
  • Which chemical equation below shows a combination (or synthesis reaction?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!