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]
3 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]3 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
R indicates round seeds that are dominant over the wrinkled variety, represented by r. For each numbered individual in the pedig
Dmitry [639]

Answer:

it is incomplete, is this te entire tree

Explanation:

8 0
3 years ago
What is the maximum number of electrons that any 'p' sublevel can hold? 2 electrons 6 electrons 8 electrons 10 electrons
Varvara68 [4.7K]
6 electrons... 's' can hold 2..... 'd' can hold 10 and 'f' can hold 14
6 0
3 years ago
Read 2 more answers
The Law of _____states that substances combine in predictable proportions and that excess reactants remain unchanged.
RideAnS [48]

Answer: definite proportions.


Explanation:


1) The definite proportions law states that compounds will always have the same kind of atoms (elements) in the same mass proportion (ratios).


2) For example, a molecule of water will alwys have the same mass ratio of hydrogen atoms to oxygen atoms. That is what permits to obtain the chemical formula of the water molecule as H₂O.


The mass of the two hydrogen atoms will be in a fixed ratio respect to the mass of the oxygen atoms.


Then, if you have one reactant in less proportion than the other, respect to the ratio stated by the chemical formula of water, the former will react completely (it is the limiting reactant) with the corresponding (proportional) mass of the later. Then there will be an excess of the later reactant which will not react (will remain unchanged).


The reactants can only react in the proportion defined by the chemical formulas of the final products.

4 0
3 years ago
Read 2 more answers
How much heat is absorbed when 447 g of water , Cp = 4.184 J/goC, goes from 25.0 oC to 35.0 oC?
Digiron [165]

Answer:

The answer to your question is  Q = 18702.5 J

Explanation:

Data

mass of water = m = 447 g

Cp = 4.184 J/g°C

Temperature 1 = T1 = 25°C

Temperature 2 = T2 = 35°C

Heat = Q = ? Joules

Process

1.- Write the formula to calculate heat

    Q = mCp(T2 - T1)

2.- Substitution

    Q = (447)(4.184)(35 - 25)

3.- Simplification

    Q = (447)(4.184)(10)

4.- Result

    Q = 18702.5 J

8 0
3 years ago
Which best describes a difference between energy transformation in power plants and dams?
gogolik [260]

Answer:

Which best describes a difference between energy transformations in power plants and dams? Only power plants use fossil fuels to transform energy. Only dams use fission to generate thermal energy. ... Only dams use mechanical energy to produce electricity.

Explanation:

HOPE THIS HELP

PICK ME AS THE BRAINLIEST

6 0
3 years ago
Other questions:
  • 6. How do you identify which is the solute and which is the solvent in solutions that are in the same phase?
    5·1 answer
  • How many covalent bonds does carbon form in neutral compounds?
    8·1 answer
  • What are the three particles of an atom? A. Neutron, electron, and ion B. Proton, neutron, and electron C. Electron, proton, and
    15·1 answer
  • Name the stayers of the epiderous in order from bottom layer to top layer
    6·1 answer
  • The sun warming the surface of a rock is<br> conduction<br> convection<br> radiation
    6·2 answers
  • Which of these pairs of elements have the same number of valence electrons?
    12·2 answers
  • What role do particles play in exterting pressure?
    13·1 answer
  • (will give brainliest!! please help me! thank you!)
    7·1 answer
  • Calculate the mass of sodium hydroxide needed to make a 5.00L with a molarity of 0.400M​
    12·1 answer
  • Which of the following is a pure substance?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!