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
jonny [76]
3 years ago
6

1. A 5.05 g sample of quartz (SiO2) contains 2.36 g of silicon. What are the percentages of silicon

Chemistry
1 answer:
hammer [34]3 years ago
6 0

Answer: B) 46.7% Si and 53.3% O

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of element}=\frac{\text{Mass of element}}{\text{total mass}}\times 100\%

Mass of quartz  (SiO_2) = 5.05 g

Mass of silicon = 2.36 g

Mass of oxygen = Mass of quartz  (SiO_2) - mass of silicon = 5.05g - 2.36 g = 2.69 g

\text{Mass percent of silicon}=\frac{\text{Mass of silicon}}{\text{total mass of quartz}}\times 100=\frac{2.36}{5.05}\times 100=46.7\%

\text{Mass percent of oxygen}=\frac{\text{Mass of oxygen}}{\text{total mass of quartz}}\times 100=\frac{2.69}{5.05}\times 100=53.3\%

Thus the percentages of silicon and oxygen in quartz are B) 46.7% Si and 53.3% O

You might be interested in
Increasing order of unsaturation
Basile [38]

Whats the question? Im not sure what your asking

7 0
3 years ago
Compounds X and Y both have the formula C7H14. Both X and Y react with one molar equivalent of hydrogen in the presence of a pal
ArbitrLikvidat [17]

Answer:

See explanation and image attached

Explanation:

Alkenes undergo hydrogenation to give the corresponding alkanes. Where the structure of the original alkene is unknown, we can deduce the structure of the alkene from the structure of the products obtained when it undergoes various chemical reactions.

Now, the fact that we obtained 2-methylhexane upon hydrogenation and the two compounds had different heats of hydrogenation means that the two compounds were geometric isomers. The original compounds must have been cis-2-methyl-3-hexene and trans-2-methyl-3-hexene.

When reacted with HCl, the same compound C7H15Cl is formed because the stereo chemistry is removed.

However, we know that the trans isomer is more stable than the cis isomer hence the cis isomer always has a higher heat of hydrogenation than the trans isomer. Thus X is cis-2-methyl-3-hexene.

4 0
3 years ago
A student is taking notes about the four steps in hurricane formation. Which of the following should be written as step number 1
Brrunno [24]
Tropical disturbance is the correct answer
3 0
3 years ago
If the mass of an object is 60.0 grams and the density of the object is 15.0 g/mL, what is the volume of the object? The formula
laila [671]

Answer:

168.56 mL

Explanation:

density = mass/volume, use basic algebra skills to replace the volume and solve

7 0
2 years ago
What is the equation for the dehydration of the CoCl2 hydrate?
natulia [17]
The dehydration of the CoCl₂ hydrate is as follows:

CoCl₂l•6H₂O(s) + heat --> CoCl₂(s) + 6H₂O(g)
3 0
3 years ago
Other questions:
  • A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reac
    15·2 answers
  • The ___ fluid compartment consists of fluid contained within all cells in the body and contains 2/3 of the body water in healthy
    5·1 answer
  • A solution is prepared by mixing 2.88 mol of acetone with 1.45 mol of cyclohexane at 30°C. 2nd attempt Calculate the χacetone an
    9·1 answer
  • A crime scene investigator is called in to evaluate a crime scene. The victim is lying on the floor with no apparent trauma. Wha
    5·2 answers
  • . A standard dry cell has an output voltage of A. 1.5 VDC. B. 1.1 VDC. C. 1.2 VDC. D. 2.0 VDC.
    11·1 answer
  • PLEASE HELP ME!
    7·2 answers
  • What is the mass, volume, density, and substance for block D:
    10·1 answer
  • The density of copper decreases as temperature increases (as does the density of most substances). Which change occurs in a samp
    9·1 answer
  • When rocks grind and squeeze past each other,___metamorphism occur.
    8·2 answers
  • A body-centered cubic unit cell has an edge length of 588 pm. What is the radius of the atoms composing the unit cell?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!