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
nignag [31]
3 years ago
10

Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 23.0 mg .

Chemistry
1 answer:
Nataliya [291]3 years ago
3 0
From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 gram
mass of nitrogen = 14 grams
mass of oxygen = 16 grams
mass of chlorine = 35.5 grams
Therefore,
molar mass of <span>c17h22clno4 = 17(12) + 22(1) + 35.5 + 14 + 4(16) = 339.5 grams

number of moles = mass / molar mass
number of moles = (23*10^-3) / (339.5)
number of moles = 6.77 * 10^-5 moles

number of atoms = number of moles * Avogadro's number
number of atoms = 6.77*10^-5 * 6.022*10^-23
number of atoms = 4.079 * 10^-27 atoms</span>
You might be interested in
The term “periodic” helps identify _______ that occur in the table, like electronegativity or atomic radii.
stepan [7]

Answer: ITS C OR B I THINK BUT I HAVE A FEELING ITS ONE OF THOSE

Explanation:

IM SO SORRY IF ITS WRONG KSDBDZDH

8 0
3 years ago
Read 2 more answers
A 1.2 L weather balloon on the ground has a temperature of 25°C and is at atmospheric pressure (1.0 atm). When it rises to an el
musickatia [10]

Answer:

T_2=335.42K=62.27^oC

Explanation:

Hello,

In this case, by using the general gas law, that allows us to understand the pressure-volume-temperature relationship as shown below:

\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}

Thus, solving for the temperature at the end (considering absolute units of Kelvin), we obtain:

T_2=\frac{P_2V_2T_1}{P_1V_1}=\frac{1.8L*0.75atm*(25+273.15)K}{1.2L*1.0atm} \\\\T_2=335.42K=62.27^oC

Best regards.

4 0
3 years ago
Read 2 more answers
What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

According to the given conditions, the equation will become as follow

pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

pH=6.86 + log(\frac{0.058}{0.042})

pH=7.00

5 0
3 years ago
Its on the pic so plz look
Gre4nikov [31]

Answer:

Subscript

Explanation:

Hope this helps

3 0
3 years ago
Read 2 more answers
Explain the arrangement of particles in solids, liquids and gases.​
Alex787 [66]
Solids are tightly compacted
Liquids are medium
And gases are very spaced and floating around
6 0
3 years ago
Other questions:
  • There is a "short-cut" to determining the number of valence electrons. how can you determine the number of valence electrons by
    15·1 answer
  • The atomic mass for Fluorine is greater than 9. The atomic number for Fluorine is 9, so the NUCLEUS of the atom has: *
    5·1 answer
  • Draw the addition product formed when one equivalent of hcl reacts with the following diene.
    13·1 answer
  • How are microchips made?
    9·2 answers
  • A 0.100 M solution of K2SO4 would contain the same total ion concentration as which of the following solutions? 0.0800 M Na2CO3
    13·1 answer
  • Why do you think properties of materials used would be considered a constraint?
    5·1 answer
  • What is a phase change that occurs when a solid transitions directly into a gas state without becoming a liquid?
    15·1 answer
  • 3. How is the equilibrium position of this reaction affected
    15·1 answer
  • Which correctly lists two characteristics of crystal faces that define crystal systems?
    11·2 answers
  • A man of 450N covers an area of 0.015m² standing on his feet. Calculate the pressure exerted by his feet on the ground.​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!