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
DaniilM [7]
3 years ago
6

A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air

Chemistry
1 answer:
RSB [31]3 years ago
4 0
Yessirrrrrrr wee litttttttt sirrrrr
You might be interested in
The reaction of an acid and a base will always produce what kind of salt?
Musya8 [376]

Explanation:

E maybe i am not sure or C

4 0
3 years ago
Most of the elements in the periodic table are
Otrada [13]
Most of the elements in the periodic table are METALS........
8 0
3 years ago
which statement correctly explains how magnesium and chlorine combine to form magnesium chloride? A) A Cl atom donates two elect
DiKsa [7]

Answer:  D) An Mg atom donates one electron to each of the two Cl atoms.

Explanation: Ionic compound is formed by transfer of electrons from metal to non metal.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here magnesium is metal with atomic number 12 and chlorine is a non metal with atomic number of 17.

Mg:12:1s^22s^22p^63s^2

Mg^{2+}:10:1s^22s^22p^6

Cl:17:1s^22s^22p^63s^23p^5

Cl^-:18:1s^22s^22p^63s^23p^6

Thus magnesium loses two electrons to form Mg^{2+} and chlorine atoms gain one electron each to form Cl^-

Thus the compound formed is MgCl_2.

4 0
3 years ago
Read 2 more answers
Certain minerals exclude lead but not uranium from their crystal structure, so when the minerals form they have no lead, only ur
likoan [24]

Answer:

The answer is "1.4 \ \bold{ billion-years}".

Explanation:

Using formula:

\to N_{Now} = N_{orige}e^{\lambda t}  \\\\

\to 1 U atom produces 1 Pb atom after decay.

\to U's original numbers are now the sum of U counts and Pb counts.

 \to N_U=(N_U+N_{pb})e^{\lambda Ut}

\to 1 = (1+3) \ exp[(\frac{-\ln(2)}{t_{(half)}} \times t ]\\\\\to t = [\frac{\ln(4)}{\ln(2)}] \times t_{(half)}

      = 14 \times 10^8 \ \ years\\\\=1.4 \ billion \ \ years

7 0
3 years ago
Find the value of <br> 17/15 •2/11
Anika [276]

Answer:

17/15 x 2/11 = 34/165

6 0
3 years ago
Read 2 more answers
Other questions:
  • Which is one way that Dalton's atomic theory has been shown to be incorrect?
    13·1 answer
  • How many valenence electons does sodium have?
    6·2 answers
  • 8. Calculate the percentage composition of sodium nitrate, NaNO3.
    5·1 answer
  • Which of the following is true about chemical equilibrium systems?
    7·1 answer
  • A forklift raises a crate weighing 8.35 × 10Æ newtons to a height of 6.0 meters. What amount of work does the forklift do?
    5·2 answers
  • KMnO4<br><br> Assign oxidation numbers to each element in this compound.
    10·1 answer
  • I NEED THE ANSWER QUICKKK!!!
    6·1 answer
  • Explain why the nucleus of an atom is positively charged but the overall charge of an atom is neutral
    11·1 answer
  • How does the energy of an electorn change when the electron moves closer to the nucleus?
    13·1 answer
  • Heteropoly tungstate supported on tantalum oxide: A highly active acid catalyst for the selective conversion of fructose to 5-hy
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!