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
noname [10]
2 years ago
13

A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this informa

tion, can the chemist answer the question of which compound is in the sample?
Chemistry
1 answer:
Arte-miy333 [17]2 years ago
5 0

Yes , the chemist can answer if the compound in K2O or K2O2

The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.

In the compound K2O

molecular mass= 2x 39+16 =94

mass ratio of K in compound= 78/94 = 0.830

In the compound K2O2

molecular mass= 2x 39+16X2 =110

mass ratio of K in compound= 78/110 = 0.710

and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2

If the ratio is anything different from 0.830 and 0.710 then the compund will be something different

#SPJ9

You might be interested in
a sample of an unknown gas has a mass of 0.582g. it's volume is 21.3 mL a a temp of 100 degrees Celsius and a pressure of 754 mm
Zielflug [23.3K]

Answer:

Molar mass = 0.09 × 10⁴ g/mol

Explanation:

Given data:

Mass = 0.582 g

Volume = 21.3 mL

Temperature = 100°C

Pressure = 754 mmHg

Molar mass = ?

Solution:

(21.3 /1000 = 0.0213 L)

(100+273= 373 K)

(754/760 = 0.99 atm)

PV = nRT

n = PV/RT

n = 0.99 atm × 0.0213 L / 0.0821 atm. L. mol⁻¹. k⁻¹ × 373 K

n =0.02 mol/ 30.6

n = 6.5 × 10⁻⁴ mol

Molar mass = Mass/ number of moles

Molar mass = 0.582 g / 6.5 × 10⁻⁴ mol

Molar mass = 0.09 × 10⁴ g/mol

6 0
3 years ago
mass number is the number of protons and neutrons in the nucleus of an isotope . how many electrons in an oxygen-18 atom ?
xenn [34]

Answer:

In neutral oxygen atom 8 electrons are present

Explanation:

3 0
3 years ago
One scientist discovered an accurate way to measure the temperature of planets. When would the scientist's discovery most likely
never [62]

Answer:

When the scientific community retest and accepts the results

Explanation:

Mark me brainlist pls

4 0
3 years ago
How many atoms are in 70.00 grams of oxygen.
Nookie1986 [14]

Answer:

A. is the correct choice.

Explanation:

If there are 70.00 g of Oxygen then it would be molecules, in which there is only 1 option with molecules.

<u><em>I am NOT professional. There is a chance I am wrong. Please reply to me if I made a mistake.</em></u>

8 0
3 years ago
What is the conjugate base?
Ksenya-84 [330]

Explanation:

A more general definition is that a conjugate base is the base member, X-, of a pair of compounds that transform into each other by gaining or losing a proton. The conjugate base is able to gain or absorb a proton in a chemical reaction. The conjugate acid donates the proton or hydrogen in the reaction.

7 0
3 years ago
Other questions:
  • August kekule described the various ring structures of the carbon compound benzene. What type of chemist would he be considered
    15·2 answers
  • Name four types of pathogens that could cause infectious disease??
    14·1 answer
  • How do you solve this problem
    14·1 answer
  • How much sulfur (in tons), present in the original materials, would result in that quantity of S)2
    11·1 answer
  • I need help with this question which letter is it?
    12·1 answer
  • Which has a greater amount of particles, 1.00 mole of hydrogen (H) or 1.00 moles of oxygen(0)?
    11·1 answer
  • How many atoms are in 55g of H2SO4?<br> 3.4 atoms<br> 2.58 atoms<br> 04.14 atoms<br> 98.1 atoms
    10·2 answers
  • A reaction has a rate constant of 1.15 x 10^−2 /s at 400K and 0.685 /s at 450K.
    8·1 answer
  • A quantity of 200 mL of 0.862 M HCl (aq) is mixed with 200 mL of 0.431
    11·1 answer
  • Chemistry help!<br><br>Zoom in to see better!!​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!