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
dimaraw [331]
2 years ago
6

How many molecules of ethanol (c2h5oh) (the alcohol in alcoholic beverages) are present in 155 ml of ethanol? the density of eth

anol is 0.789 g/cm3?
Chemistry
1 answer:
ozzi2 years ago
4 0

First convert volume to mass:

mass = 0.789 g/mL * 155 mL = 122.295 g

 

Then convert mass to number of moles:

number of moles = 122.295 g * (1 mole / 46 g) = 2.66 moles

 

Using avogadros number, we get the molecules:

<span>number of molecules = 2.66 moles * 6.022 x 10^23 molecules / mole = 1.6 x 10^24 molecules</span>

You might be interested in
Calculate the amount of heat necessary to raise the temperature of 135.0 g of water from 50.4°F to 85.0°F. The specific heat of
MAXImum [283]

Here we have to calculate the heat required to raise the temperature of water from 85.0 ⁰F to 50.4 ⁰F.

10.857 kJ heat will be needed to raise the temperature from 50.4 ⁰F to 85.0 ⁰F

The amount of heat required to raise the temperature can be obtained from the equation H = m×s×(t₂-t₁).

Where H = Heat, s  =specific gravity = 4.184 J/g.⁰C, m = mass = 135.0 g, t₁ (initial temperature) = 50.4 ⁰F or 10.222 ⁰C and t₂ (final temperature) = 85.0⁰F or 29.444 ⁰C.

On plugging the values we get:

H = 135.0 g × 4.184 J/g.⁰C×(29.444 - 10.222) ⁰C

Or, H = 10857.354 J or 10.857 kJ.

Thus 10857.354 J or 10.857 kJ heat will be needed to raise the temperature.

6 0
3 years ago
An ionic bond forms between sodium chorine when the sodium atoms _______ electrons.
Natalija [7]

is 7 cus  the valance electron for sodium is Ne 3s1  and for chlorine is Ne 3s13p5

4 0
3 years ago
PLEASE ANSWER 30 POINTS !!
Alexeev081 [22]
Can u explain it more plz.
3 0
3 years ago
Read 2 more answers
Humanities I
Inessa05 [86]

Answer:

✓ scholastics

Explanation:

you d.ont need a expla.nation rig.ht un.less y.ou wan.na re.ad for an h.our

3 0
2 years ago
For the following word equations, write it as a chemical equation, then balance it.
Lorico [155]

4K+O2-----------2K2O

7 0
3 years ago
Other questions:
  • Describe the preparation of 2.000 L of 0.0500 M AgNO3 (169.87 g/mol) from the primary-standard-grade solid.
    8·1 answer
  • 9.56 x 10^5 cg is how many grams?
    5·1 answer
  • What is the molarity of a CaCl2 solution containing 330 grams of CaCl2 in 1 liter of solution?
    9·1 answer
  • What is the chemical formula of the ionic compound that forms from potassium and bromine?
    14·1 answer
  • Contains a nonmetal and metal
    15·1 answer
  • Many scientists think that this single event caused the extinction of most the dinosaurs which led to the rise of mammals which
    14·1 answer
  • Another name for a renewable energy source
    12·1 answer
  • Is soap solution a strong, weak or non electrolyte
    14·1 answer
  • With a gas station on almost every corner, it’s hard to imagine life without fossil fuels. Fossil fuels power everything from ho
    15·2 answers
  • Proteins have two main secondary structures: _______, which are spirals formed by hydrogen bonds between amino acids, and ______
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!