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
aivan3 [116]
3 years ago
14

How many ethyne molecules are contained in 84.3 grams of ethyne (C2H2)?

Chemistry
2 answers:
ololo11 [35]3 years ago
6 0
(~26grams/mole) and Avogadros # (6.022x10^23) 84.3grams x 1mole/26grams x 6.022x10^23 molecules/mole = 1.95x10^24 molecules of C2H2
ahrayia [7]3 years ago
6 0

Explanation:

According to the mole concept, there are 6.022 \times 10^{23} atoms or molecules present in 1 mole.

As, it is given that mass of ethyne is 84.3 g. Hence, calculate its number of moles as follows.

          No. of moles = \frac{mass}{\text{molar mass}}

                                 = \frac{84.3 g}{26.04 g/mol}

                                 = 3.24 mol

Therefore, calculate number of ethyne molecules as follows.

                 3.24 mol \times 6.022 \times 10^{23} atoms

                    = 19.51 \times 10^{23} atoms

Thus, we can conclude that there are 19.51 \times 10^{23} atoms in 84.3 grams of ethyne.

You might be interested in
Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts wit
riadik2000 [5.3K]

Answer:

A) SiO2 is the limiting reactant

B) Theoretical yield= 72333.3g

C) % yield =91.5%

Explanation:

SiO2(s) + 2C(s) --------------> Si(s) + 2CO(g)

n(SiO2)= 155000/60 = 2583.33 mols

n(C)= 79000/12= 3291.66 mols

a)SiO2 is the limiting reactant

According to the balanced reaction equation,

60g of SiO2 produced 28g of SiO2

155000g of SiO2 will produce 155000×28/60= 72333.3g

Therefore theoretical yield of Si= 72333.3g

% yield= 66200/72333.3×100/1 =91.5%

5 0
3 years ago
Why cant magnesium ions be detected in a flam test?
Dmitry [639]
When magnesium ion doesn't give any characteristics colour with the flame test as electronic transisitons do not give out visible light.
6 0
3 years ago
Imagine that A and B are cations and X, Y, and Z are anions, and that the following reactions occur:
Gekata [30.6K]
<span>AX(aq)+BY(aq)→no precipitate
AX(aq)+BZ(aq)→precipitate
this two equations imply
</span>
AX(aq) is soluble and <span>BY(aq) is insoluble

the answer is
</span><span>E. BY</span>
5 0
3 years ago
What does Prokaryotic have that other cells does not
stiks02 [169]

Answer:

Prokaryotes are unicellular organisms that lack membrane-bound structures, the most noteworthy of which is the nucleus. ... While prokaryotic cells do not have membrane-bound structures, they do have distinct cellular regions. In prokaryotic cells, DNA bundles together in a region called the nucleoid.

4 0
3 years ago
How many grams of carbon dioxide are produced when 16 g of methane and 48 g of oxygen gas combust
larisa [96]
I believe the correct answer is 11 g
6 0
2 years ago
Other questions:
  • Match the correct properties and characteristics of each type of rock?
    11·2 answers
  • How many moles is 24 grams of carbon?
    14·2 answers
  • What is an organism that survives on a hist organism and cuases harm to the host
    15·2 answers
  • Calculate the number of molecules?
    9·1 answer
  • Please help me very easy will biraly and 5 star and thanks
    13·2 answers
  • The symbol Na represents a sodium atom that has lost an electron. True False
    5·1 answer
  • Please help
    10·2 answers
  • Which process is responsible for bending and curving of rock layers
    8·2 answers
  • If the two copies of a gene for each feature are the same version and provide instructions for only one type of protein, they ar
    7·1 answer
  • 22. Which type of battery can be recharged: a zinc-carbon battery, or an alkaline battery?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!