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
laila [671]
3 years ago
15

Can someone answer these few questions please?

Chemistry
1 answer:
Simora [160]3 years ago
5 0

Answer:

2.10x10⁻⁹ moles of Si, 143.7 moles of CCl₄, 3.49x10²⁴ atoms

Explanation:

These is the relation:

NA (6.02x10²³) ⇒ 1 mol of particles (it can be, atoms or molecules)

This are the rule of three:

NA of atoms occupies 1 mol of Si

1.27x10¹⁵ atoms will occupy (1.27x10¹⁵  .1 ) / NA = 2.10x10⁻⁹ moles of Si

NA of molecules are contained in 1 mol of CCl₄

8.65x10²⁵ molecules are contained in (8.65x10²⁵  .1)/ NA = 143.7 moles

1 mol of Ca has NA atoms

5.80 moles of Ca will have (5.80 . NA) = 3.49x10²⁴

You might be interested in
Beryllium, Be, and chlorine, Ci, form a binary ionic compund with a one-to-two ration of beryllium ions to chloride ions. The fo
White raven [17]
Be2Cl because the number get switched
7 0
4 years ago
Read 2 more answers
A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what i
musickatia [10]
0.75 atm. is the answer

7 0
3 years ago
Read 2 more answers
Given what you have learned about the hydrogen bonding shared between nucleic acids in dna, which pair is more stable under incr
Vinil7 [7]
Cytosine (C) and Guanine (G) are more steady under expanding heat since C and G have three hydrogen bonds while Adenine (An) and Thymine (T) have just two. The more hydrogen bonds there are, the more steady the nucleotides are. More bond dependability requires more warmth vitality to separate the securities, and since G≡C have more hydrogen securities than A=T, they are thusly more steady under expanding heat.
8 0
4 years ago
The most common form of matter in the universe
attashe74 [19]

Answer:

Plasma

Explanation:

6 0
4 years ago
A student calculates that the volume of his textbook is 991.880 cm3. what is the volume written with 3 significant figures?
k0ka [10]

The volume of the textbook calculated by the student written to 3 significant figures is 992cm³

  • According to this question, a student calculates the volume of his textbook and arrived at an answer of 991.880 cm³.

  • To round up this digit to 3 significant figures, which means that only 3 significant numbers should appear in the answer.

  • To do this, the number after the third number is 8, which means we can round up the value of 1 to 2. Hence, the volume of the textbook calculated by the student is 992cm³ in 3 s.f.

Learn more at: brainly.com/question/16563962?referrer=searchResults

7 0
3 years ago
Other questions:
  • A higher temperature of fresh concrete results in a __________ hydration of cement.
    11·1 answer
  • Is NaCH an element ? why or why not?
    7·2 answers
  • Write out a detailed mechanism of the acid catalyzed dehydration of cyclohexanol. use only hydronium as your acid source.
    5·1 answer
  • What is the defienition of liquid, solid, and gas in a complicated paragraph. At least 5 sentences.
    14·1 answer
  • What is the concentration of a solution which contains 0.446 g of C6H14N4O2 IN 1.250 L of solution? M
    8·1 answer
  • How many kilograms of oxygen did Samantha need to utilize to react with 36.29 kg of triglycerides (C55H104O6)?
    9·1 answer
  • Write the definition of digital in your words. <br> Will get brainliest.
    8·2 answers
  • Indium-116 is radioactive and has a half life of 14.10 seconds. How long would it take a sample to decay from 7.70 mg to 900 µg.
    14·1 answer
  • HELP PLEASE
    9·1 answer
  • There are clouds forming over Florida. The temperatures in the clouds and in the air are above freezing. Which form of precipita
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!