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
inessss [21]
3 years ago
5

how many moles of silicon are in 245 g of silicon? a. 8.72 mol b. 28.0 mol c. 1.10 × 10-1 mol d. 6.90 × 103 mol

Chemistry
2 answers:
il63 [147K]3 years ago
8 0
Atomic mass silicon = 28.085 u

1 mol Si ---------------- 28.085 g  
?  ------------------------ 245 g

245 x 1 / 28.085 => 8.72 mol

answer A
skad [1K]3 years ago
5 0

Answer:

The answer to How many moles of silicon are in 245 g of silicon? is:

a. 8.72 mol

Explanation:

To resolve this problem, we need to know the Silicon atomic weight, we can find this information in  the periodic table of elements

Si= 28.0855 \frac{g}{mol}

This means that for every mole, there are 28.0855 grams of Silicon

Now, with this information we can find the answer to this problem:

245 g*\frac{1 mol}{28.0855 g} = 8.72 mol of Silicon

You might be interested in
What is the equation for determining gas pressure?
Advocard [28]

Answer:

Explanation:

First, let's review the ideal gas law, PV = nRT. In this equation, 'P' is the pressure in atmospheres, 'V' is the volume in liters, 'n' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas constant (0.0821 liter atmospheres per moles Kelvin)

8 0
3 years ago
Read 2 more answers
Which elements are necessary to accomplish work?
lawyer [7]

Answer:

D) force,cause, displacement

3 0
2 years ago
Read 2 more answers
Is a octopus a carnivore or a herbivore
timofeeve [1]
Carnivore, but some are herbivores
4 0
3 years ago
if an iron nail is placed in a glass of water the nail will sink. Is the density of iron smaller than or larger than the density
Gala2k [10]
It has  more density when it sinks because the water pushes away thats why people float they are less dense 
5 0
2 years ago
If they travel 75 meters in 10 seconds, how many meters must they travel each second?
kobusy [5.1K]

Answer:

Step-by-step explanation: We are asked to find the distance covered by a man in 15 minutes at a speed of 16 km/hr. 15 minutes = 15/60 hour. Therefore, the person can run 4 km in 15 minutes.

Explanation:

4 0
2 years ago
Other questions:
  • If I use 0.0395 kg of water to dissolve 0.0189 kg of salt, what is the mass percent of this solution?
    6·1 answer
  • How are the inner core and outer core diffrent?How are they similar
    15·1 answer
  • What is the relationship between matter and elements
    6·1 answer
  • Predict the moon phases
    6·1 answer
  • If a girl is 99 lb's and she eats a lb of nacho does that mean she is 1% nacho
    9·2 answers
  • Which element is considered to be a transition element?<br> F<br> Sn<br> Cu<br> Na
    5·1 answer
  • An atom of a mystery element contains 6 protons, 6 electrons, and 8 neutrons.
    11·1 answer
  • When does absorption occur in infrared spectroscopy
    6·1 answer
  • Nfpa diamond for benzoic acid
    6·1 answer
  • Please help with chemistry homework
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!