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
cluponka [151]
2 years ago
9

The 64.8-g sample of the compound X2O5 contains 48.0 g of oxygen atoms. What is the molar mass of element X?

Chemistry
1 answer:
Vaselesa [24]2 years ago
8 0
The answer is 14 g/mol.

The number of moles (n) is the ratio of mass (m) and molar mass (M):
n = m : M

Step 1. Calculate number of moles of oxygen in the compound.
n = ?
m = 48 g
M = 16 g/mol

n = m/M = 48 g : 16 g/mol = 3 mol


Step 2. Calculate the number of moles of the element X:
5 atoms of oxygen is 3 mol.
2 atoms of element X is x
5 : 3  = 2 :x
x = 2 * 3 / 5 = 6/5 = 1.2 mol

Step 3. Calculate <span>the molar mass of element X
</span>n = 1.2 mol
m = 64.8 g - 48 g = 16.8 g
M = ?

n = m : M
M = m : n
M = 16.8 g : 1.2 mol = 14 g/mol
You might be interested in
12. help idk what to do at this point , I have notes and study till 3am , I still need help
GaryK [48]
I’m not good at this but I’m guessing it’ll be the first one!
5 0
3 years ago
Read 2 more answers
Cis-4-tertButylcyclohexyl bromide (compound 1) and Trans-4 tert Butylcyclohexylbromide (compound 2) are reacted with Potassium T
Mkey [24]

Answer:

In compound 1 the Tert butyl group occupies the equatorial position and the Bromine occupies the axial position and in compound 2 the Tert butyl occupies the axial and the bromine occupies equatorial positions. Compound 1 reacts faster than compound 2.

Explanation:

In cyclic organic compounds, substituents may occupy the axial or equatorial positions. The axial positions are aligned parallel to the symmetry axis of the ring while the equatorial positions are around the plane of the ring.

Bulky substituents have more room in the equatorial than in the axial position. This means that compound 1 is more stable than compound 2.

This is clear on the basis of stability of the molecules because compound 1 will react faster than compound 2 since the bulky tertiary butyl group in compound 1 occupy equatorial and not axial positions.

4 0
3 years ago
I was wondering what the answer for this question would be ?
mixer [17]

Answer:

C. H2O is the base and H3O+ is the conjugate acid

Explanation:

According to Bronsted-Lowry acid-base theory, an acid is a substance that loses an hydrogen ion or proton (H+) while a base is a substance that gains an hydrogen ion (H+) or proton. Furthermore, this theory states that, the molecule formed when an acid donates its proton is called the CONJUGATE BASE, while the molecule formed when the base accepts proton is called CONJUGATE ACID.

In this question, the following equation is given:

NH4+(aq) + H2O(aq) ⇌NH3(aq) + H3O+ (aq)

Water (H2O) is the base in this equation because according to Bronsted-Lowry acid-base theory, it accepts an hydrogen ion (H+) while hydroxonium ion (H3O+) is the conjugate acid.

7 0
3 years ago
In a physical change the make up of matter is changed.<br> O True<br> O False
n200080 [17]

Answer:

yes it is true

Explanation:

evaporation occurs when burning liquid water changes into gas.

6 0
3 years ago
Can someone please help me
Bumek [7]
The answer is A. I think
5 0
3 years ago
Read 2 more answers
Other questions:
  • For each row in the table below, decide whether the pair of elements will form a molecular or ionic compound. If they will, then
    6·1 answer
  • A preliminary untested explanation that tries to explain how or why things happen in the manner observed is a scientific
    6·2 answers
  • Which of the following has three electrons in its valence shell?
    7·2 answers
  • A mercury thermometer is used to take four temperatures of a solution
    15·1 answer
  • The change in entropy, Δ????∘rxn , is related to the the change in the number of moles of gas molecules, Δ????gas . Determine th
    14·1 answer
  • Please help !!!
    6·1 answer
  • What is the frequency of yellow light, which has a wavelength of 5.56 x 10^-7 m?
    10·1 answer
  • All atoms of an element have the same number of ________. electrons neutrons protons protons plus neutrons
    10·1 answer
  • Need help on this question
    9·1 answer
  • . Each antibody is designed to fight off how many pathogens
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!