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
topjm [15]
3 years ago
13

You find a compound composed only of element "X" and hydrogen, and know that it is 91.26% element X by mass. Each molecule has 2

.67 times as many H atoms as X atoms. What is element X?
Chemistry
2 answers:
worty [1.4K]3 years ago
4 0
Since you know the ratio of atoms, you can start to put a formula togeter. The formula might look like:<span>
X<span>H2.67 
</span></span>but since atoms can't come in fractional amounts, we have to multiply the formula by some number in order to turn 2.67 into a whole #, while still maintaining the ratio. Multiplying 2.67 by 3 yields 8, so the most likely ratio in the molecule is

X3H8<span>so the ratio of 1:2.67 is still maintained. The mass percent tells you that out of every 100g of compound, 91.26g is element X, so the other 8.74g must be H. Dividing each mass by the number of moles in the formula gets us the molar mass of each element (approximately). DIviding 8.74g by 8 gets 1.09, roughly the molar mass of hydrogen. Dividing 91.26g by 3 gets us 30.4, roughly the molar mass of phosphorus. Element X is most likely phosphorus</span>
AlekseyPX3 years ago
3 0

Answer:

The element X is silicon.

Explanation:

Percentage of element X in compound molecule = 91.26%

Number of X element atom in a molecule = n

Number of hydrogen atom in a molecule = n × 2.67

Molecular formula of compound = H_{2.67n}X_{n}=H_{267}X_{100}

Let the atomic mass of element X = m

Molar mass of compound =267 g/mol+100m

Percentage of an element in a compound:

\%=\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100

91.26\%=\frac{100 m}{267 g/mol+100m}\times 100

m = 27.87 g/mol ≈ 28 g/mol

The element X is silicon.

You might be interested in
Which of these pairs of elements have the same number of valence electrons?
ElenaW [278]
The correct answer is the second option; sodium (Na) and potassium (K.)
Both sodium and potassium have the same number of valence electrons. 
6 0
3 years ago
_AlBr3+_K2SO4&gt;_KBR+_Al2(SO4)3
Misha Larkins [42]

Answer:

Balancing chemical equation means making a number of atoms or molecules equal on both sides. In other words, this means that the number of atoms and molecules of each reacting element needs to be the same as the number of atoms and molecules of those elements in the product.

Our reaction is:

AlBr3 + K2SO4 -> KBr + Al2(SO4)3

and we need to balance it.

Since there are 3 molecules of SO4 in the product we need to put 3 before the reactant K2SO4. There are also 2 atoms of Al in the product, so we need to put 2 in front AlBr3. Now we have 6 atoms of K and Br on the left side, so we need to put 6 in front of KBr in the product.

So, our balanced equation will look like this:

2AlBr3 + 3K2SO4 -> 6KBr + Al2(SO4)3

8 0
3 years ago
Which substance made up minerals
Alenkasestr [34]

Answer

Chemical element

Explanation:

4 0
3 years ago
Read 2 more answers
How do you draw a bohr diagram for a boron ion?
Otrada [13]
Because Boron likes to lose 3 electrons when it undergoes ionization, we draw a boron ion like a helium atom, with just 2 electrons in the first shell, and 0 in the second

5 0
3 years ago
Read 2 more answers
Why is dissolving important??
Irina18 [472]

Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the air, the ground, or through our bodies, it takes along valuable chemicals, minerals, and nutrients.

4 0
3 years ago
Other questions:
  • How many mL are in a cubic centimeter? 1,000 10,000 100,000 <br> none of the above
    7·2 answers
  • What elements and atoms are involved in a basketball?
    9·1 answer
  • When is potential energy transformed into kinetic energy?
    9·2 answers
  • What is a metabolic pathway? What is a metabolic pathway?
    5·2 answers
  • Why are scientific models important in the study of science?
    13·1 answer
  • ¿Cuál es la diferencia entre energía térmica y energía eléctrica?
    6·1 answer
  • Which statement is true about the particles of a liquid when the liquid changes into a solid?
    6·1 answer
  • 1) In the boxes below, draw the model given in the simulation and draw a model of the molecules in an object when the object
    10·1 answer
  • ASAP!!!!!!!!!!<br>difference between a commercial and natural indicator​
    8·1 answer
  • How many moles are in 182 grams of BC13?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!