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
dlinn [17]
3 years ago
15

If there are 1.55 x 1024 molecules of hydrogen peroxide (H2O2), what is the mass of thesample? ​

Chemistry
1 answer:
bezimeni [28]3 years ago
8 0

Answer:

87.54 g of H₂O₂

Explanation:

From the question given above, the following data were obtained:

Number of molecules = 1.55×10²⁴ molecules

Mass of H₂O₂ =.?

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of H₂O₂

Next, we shall determine the mass of 1 mole of H₂O₂. This can be obtained as follow:

1 mole of H₂O₂ = (2×1) + (2×16)

= 2 + 32

= 34 g

Thus,

6.02×10²³ molecules = 34 g of H₂O₂

Finally, we shall determine mass of H₂O₂ that contains 1.55×10²⁴ molecules. This can be obtained as follow:

6.02×10²³ molecules = 34 g of H₂O₂

Therefore,

1.55×10²⁴ molecules

= (1.55×10²⁴ × 34)/6.02×10²³

1.55×10²⁴ molecules = 87.54 g of H₂O₂

Thus, 87.54 g of H₂O₂ contains 1.55×10²⁴ molecules.

You might be interested in
Help
Archy [21]
A, B & C would all be correct.
8 0
3 years ago
It is desired that an acetic acid sodium acetate buffered solution have a pH of 5.27. You have a solution that has an acetic aci
SVETLANKA909090 [29]

Answer:

0.034 M is the molarity of sodium acetate needed.

Explanation:

The pH of the buffer solution is calculated by the Henderson-Hasselbalch equation:  

pH = pK_a + \log \frac{[A^-]}{[HA]}

Where:  

pK_a= Negative logarithm of the dissociation constant of a weak acid  

[Ac^-] = Concentration of the conjugate base  

[HA] = Concentration of the weak acid

According to the question:

HAc(aq)\rightleftharpoons Ac^-(aq)+H^+(aq)

The desired pH of the buffer solution = pH = 5.27

The pKa of acetic acid = 4.74

The molarity of acetic acid solution = [HAc] = 0.01 M

The molarity of acetate ion =[Ac^-] = ?

Using Henderson-Hasselbalch equation:  

5.27= 4.74 + \log \frac{[Ac^-]}{[0.01 M]}

[Ac^-]=0.0339 M\approx 0.034M

Sodium acetate dissociates into sodium ions and acetate ions when dissolved in water.

NaAc(aq)\rightarrow Na^+(aq)+Ac^-(aq)\\

[Ac^-]=[Na^+]=[NaAc]= 0.034M

0.034 M is the molarity of sodium acetate needed.

3 0
3 years ago
If the caffeine concentration in a particular brand of soda is 2.85 mg/oz, drinking how many cans of soda would be lethal? Assum
alina1380 [7]

Answer:

2,375 cans

Explanation:

The strategy here is to use the information given to calculate the lethal dosage contained in the number of cans we will compute.

We know the lethal dosage is

Ld = 10.0 g caffeine

and we also know that the oncentration of caffeine is:

2.85 mg/ oz

So our problem simplifies to calculate how many oz will contain the lethal dose, and then given the ounces per can determine how many cans are required.

First convert the lethal dose in grams to mg:

Ld =( 10 g x 1000 mg ) = 10,000 mg caffeine

10,000 mg x ( 1 Oz / 2.85 mg ) = 28,500 oz

28500 oz x ( 1 can/12 oz ) = 2,375 cans

We could also have calculated it in one step  using conversion factors:

Number of cans = 10000 mg x 1 oz/ 2.85 mg x 1 can / oz = 2,375 cans

7 0
3 years ago
What is 25 milliliters in cubic centimeters
lubasha [3.4K]

1cc (cubic centimeter) and 1mL (milliliter) are the same volume. So, 25mL = 25cc

3 0
3 years ago
Use the bond energies provided to estimate ΔH°rxn for the reaction below. CH3OH(l) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH°rxn = ? Bond
Temka [501]

Answer:

um la cookie on a bar was a waste of color with climax of gdhel of

8 0
3 years ago
Read 2 more answers
Other questions:
  • What is the end result of a nuclear fusion reaction? two new atoms with smaller nuclei form molecule of atoms forms one new atom
    15·2 answers
  • Help plz! its a science question
    14·2 answers
  • How can you tell pizza is a mixture
    14·2 answers
  • Which one is it (it’s multiple choice too)
    13·1 answer
  • ASAP HELP with this question!!!
    15·2 answers
  • The number of joules required to heat one gram of a substance one degree Celsius is _____.
    9·1 answer
  • cual es la importancia de conocer los numeros de oxidacion de los metales no metales y los metaloides​
    9·1 answer
  • PLeaseee help me with this.
    10·1 answer
  • PLEASE HELP ME WITH THIS I ONLY HAVE 8 MINUTES I will give you extra points . THANK YOUU
    9·1 answer
  • The aria ""batter my heart"" from doctor atomic has musical influences from which era?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!