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
Gemiola [76]
3 years ago
7

I really need help with this Im lost

Chemistry
1 answer:
Illusion [34]3 years ago
5 0
I believe it would weigh less if it’s blown up with helium because helium is lighter than air
You might be interested in
A 8L sample of gas at 250 K is cooled to 75 K. What is the volume of the gas after it is cooled?
Stells [14]

by \: Charles'\: law: \:  \\  \frac{v_{1}}{t_{1}}  =  \frac{v_{2}}{t_{2}}  \\

Where v is the volume(in L) and t is the temperature(in °K)

\frac{8}{250}  =  \frac{v_{2}}{75} \\\\4/5 =v_2/3 \\\\\boxed{v_{2} = \frac{12}{5}}\\\\\\\huge{=2.5 l}

7 0
2 years ago
Ethanol, C2H6O, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is
weeeeeb [17]

Answer:

This means 463 grams of ethanol would provide less amount of energy

Explanation:

Step 1: Data given

Heat of combustion of ethanol = 326.7 kcal/mol

The heat of combustion of octane =  1.308*10³ kcal/mol

Mass of octane = 463 grams

Molar mass octane = 114.23 g/mol

Molar mass ethanol = 46.07 g/mol

Step 2: Calculate moles octane

Moles octane = mass octane / molar mass octane

Moles octane = 463 grams / 114.23 g/mol

Moles octane = 4.05 moles

Step 3: Calculate energy of combustion of 4.05 moles octane

Combustion of 1 mol octane gives us: 1.308 * 10³ kcal/mol

Combustion of 4.05 moles octane gives us 4.05 * 1.308 * 10³ kcal/mol = <u>5.30 * 10³ kcal</u>

This means the combustion reaction of 463 grams of octane gives us 5.30 * 10³ kcal

Step 4:

Heat of combustion of ethanol = 326.7 kcal/mol

OR in words: combustion of 1 mol ethanol gives us 326.7 kcal energy

Moles ethanol = 463 grams / 46.07 g/mol

Moles ethanol = 10.05 moles

Since combustion of 1 mol ethanol gives us 326.7 kcal

10.05 moles ethanol will give us = 10.05 * 326.7 = 3283.3 kcal = <u>3.28 * 10³ kcal</u>

<u />

5.30 * 10³ kcal > 3.28 * 10³ kcal

This means 463 grams of ethanol would provide less amount of energy

3 0
3 years ago
HELP ME PLS....... PLSSSSSSSSSSSSSSSSSSSSSS
Tems11 [23]

Answer: A different group of scientists using different methods.

5 0
2 years ago
How many protons are in an element with an atomic number of 8 and a mass of 18?
Pachacha [2.7K]
B: 8 the amount of protons is equal to the atomic number
4 0
2 years ago
Read 2 more answers
replacing standard incandescent lightbulbs with energy-efficient compact fluorescent lightbulbs can save a lot of energy. Calcul
Fantom [35]
The difference between the wattage is 60-18=42W. The saving in energy over 10 hrs is 10×42=420 watt-hours=0.42kWh
8 0
3 years ago
Other questions:
  • Determine the pH of a 5x10^-4 M solution of Ca(OH)2
    5·1 answer
  • A researcher wants to determine if a unicellular organism he discovered is an autotroph or a heterotroph. He radioactively label
    12·1 answer
  • Compare and contrast exothermic and endothermic
    7·1 answer
  • What is the difference between Mixtures and Compounds? I am trying to study for my Science quiz on Tuesday, and I need to know t
    5·1 answer
  • What is the most important role that water plays for living organisms
    11·1 answer
  • oth hydrogen sulfide (H2S) and ammonia (NH3) have strong, unpleasant odors. Which gas has the higher effusion rate? If you opene
    14·2 answers
  • Some athletes have as little as 3.0% body fat. If such a person has a body mass of 67 kg , how many pounds of body fat does that
    14·1 answer
  • PLEASE HELP ASAP FOR 25 POINTS!! :D
    13·1 answer
  • When a piece of metal is irradiated with UV radiation (λ = 162 nm), electrons are ejected with a kinetic energy of 3.54×10-19 J.
    14·1 answer
  • What happens to the atoms in food once animals eat them?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!