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
Aleks04 [339]
3 years ago
9

How many molecules are in 4.00 x 10^2mg of ibuprofen?

Chemistry
1 answer:
Serggg [28]3 years ago
3 0
Start by converting mg to g. There is .001g in every miligram, so there is 0.4g in this sample.

Then find the molar mass of ibuprofen (C13H18O2) which is 206.3g/mol

Then divide grams by the molar mass to get moles of C13H18O2: (0.4g)/(206.3g/mol) = 1.94x10^-3mol C13H18O2

Then multiply moles by Avogadro's number to get molecules: (1.94x10^-3mol)/(6.02x10^23) = 1.17x10^21 molecules of ibuprofen (C13H18O2)
You might be interested in
Why does earth have uranium
Rainbow [258]
The isotope U-235 is important because under certain conditions it can readily be split, yielding a lot of energy. It is therefore said to be 'fissile' and we use the expression 'nuclear fission'. Meanwhile, like all radioactive isotopes, they decay.
5 0
3 years ago
Read 2 more answers
A manganese electrode was oxidized electrically. If the mass of the electrode decreased by 225 mg during the passage of 1580 cou
qwelly [4]

Answer:

<u>Oxidation state of Mn = +4</u>

Explanation:

Atomic mass of Mn = 55g/mol

From Faraday's law of electrolysis,

Electrochemical equivalent = \frac{mass}{charge}

i.e Z = \frac{m}{Q} = \frac{0.225g}{1580C} = 0.0001424 g/C

But Equivalent weight, E = atomic mass ÷ valency  = Z × 96,485

⇒ \frac{55}{valency} = 0.0001424 × 96,485

<u>∴ Valency of Mn = +4</u>

8 0
3 years ago
Balance the equation
lukranit [14]
If a link says to click on it please don’t it’s a scam
4 0
3 years ago
PLEASE HELP!
11111nata11111 [884]
The answer is A.......
6 0
3 years ago
Which organism is the carnivore in this food web?
mihalych1998 [28]
Among the choices, the only one that can be considered a carnivore is C. Adelie penguin. Adelie penguins are found in the Arctic, and feed on aquatic creatures such as krill, fish, and squid. Krill is a type of crustacean that feeds on phytoplankton, which is at the bottom of the food chain.
8 0
3 years ago
Other questions:
  • Calculate the mass of a body<br>Whose volume is<br>Is 2cm3 and<br> density is 520cm3​
    15·1 answer
  • What is electropositivity and electronegativity? Between group 1 and group 17, which is electropositive and electronegative?
    14·1 answer
  • Which statement describes an intensive property of matter?
    15·2 answers
  • What is the mass of 3.6 x 1024 atoms of Zinc (Zn)?
    5·1 answer
  • Most of the properties of water are due to its:
    12·2 answers
  • Are sperm and egg cells exact copies of the plant cell
    8·1 answer
  • A 4 L sample of gas at 298 K and 2 atm contains 0.250 mol of gas. If we add another 0.250 mol of gas at the same pressure and te
    5·1 answer
  • KNO
    6·1 answer
  • Good evening! Does anyone know this? Earth Science
    14·1 answer
  • Which of the following statements are true of thermal energy and kinetic
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!