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
Feliz [49]
2 years ago
7

Calculate the number of atoms in 2.5 moles of Si.

Chemistry
1 answer:
Ede4ka [16]2 years ago
7 0

Answer:

\boxed {\boxed {\sf About \ 1.5 * 10^{24} \ atoms \ Si}}

Explanation:

When converting from moles to atoms, we must use Avogadro's number. This number tells us there are 6.022 * 10²³ atoms in 1 mole. We can multiply this number by the number of moles.

First, we must set up Avogadro's number as a ratio.

\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}

Next, multiply the number of moles by the ratio.

2.5 \ mol \ Si *\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}

When we multiply, the moles of silicon will cancel.

2.5 * \frac {6.022 \ * 10^{23} \ atoms \ Si }{1}}

Since the denominator of the fraction is 1, we can cancel it out too.

2.5 *  {6.022 \ * 10^{23} \ atoms \ Si }

1.5055 * 10^{24} \ atoms \ Si

The original measurement (2.5 moles) has 2 significant figures (2 and 5). Therefore we must round to 2 sig figs. For this question, 2 sig figs is the tenth place.

The 0 in the hundredth place tells us to leave the 5 in the tenth place.

1.5 * 10^{24} \ atoms \ Si

There are about <u>1.5 * 10²⁴ atoms of silicon.</u>

You might be interested in
Un buzo que nada en las profundidades despide pequeñas burbujas de aire¿Aumenta disminuye o permanece igual el tamaño de las bur
alekssr [168]

Answer:

Al ascender las burbujas van aumentando de tamaño.

Explanation:

Las burbujas que produce el buzo debajo del agua son pequeñas moléculas de dióxido de carbono gaseoso producto de la respiración del mismo.

Ahora, a medida que las burbujas suben a la superficie, la presión que sufren estas (Presión debido al agua), es menor conforme van ascendiendo debido a la ley de Boyle: A medida que la presión aumenta, el volumen va disminuyendo.

Esto significa que al ascender las burbujas van aumentando de tamaño debido a que la presión que sufren estas es menor que cuando están a mayores profundidades.

5 0
3 years ago
Explain why fluorine and chlorine are in the same group of the periodic table.
Ivenika [448]

Answer:

They both have 7 electrons in their outer shell

8 0
2 years ago
In this model of a molecule of ammonia, NH3, how many covalent bonds are represented?
Verdich [7]
I think the answer is three but i can't be sure.
4 0
3 years ago
Plant and animal cells release energy stored in the bonds of glucose molecules when they perform _________. Question 1 options:
Dmitry_Shevchenko [17]
Cellular respiration
3 0
3 years ago
Read 2 more answers
Nena___her hair every morning. <br>A.BRUSH <br> B.BRUSHES <br>C.BRUSED <br>D. WILLBRUSHED​
coldgirl [10]

Answer:

I'm pretty sure it's A. BRUSH

Explanation:

If I'm wrong let ne know please

7 0
3 years ago
Read 2 more answers
Other questions:
  • Which is not a property covalent bonds ?
    8·1 answer
  • a compound has an empirical formula of CH2 what is the molecular formula if it's molar mass is 252.5 grams/mol
    6·1 answer
  • If I have a molar concentration of Na2S2O3 of .02M and a volume of .001L. As well as a Molar Concentration of KI .3M and H2O2 of
    8·1 answer
  • !!!!HELP ASAP 10 points!!!Which of the following families contains liquids, solids, and gases?
    12·2 answers
  • Draw a line-bond structure for CBrN. Explicitly draw all H atoms. You do not have to include lone pairs in your answer. In cases
    5·1 answer
  • Use the electronic configuration to explain the occurrence of period and groups to the periodic table.
    5·1 answer
  • The Xs show the location of beanbags a student tossed at a target. The
    8·2 answers
  • Which of the following most likely requires intermolecular forces?
    8·2 answers
  • How many kilograms of water must be added to 6.07 grams of oxalic acid (H2C2O4) to make a 0.025 m solution?
    14·1 answer
  • If 10 grams of potassium chlorate decompose to form potassium chloride and oxygen gas inside a 500 mL container at a temperature
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!