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
aleksandrvk [35]
3 years ago
13

A blimp floats because it is filled with helium gas (He) which has a smaller molecular mass than air (in g/mol). Helium can lift

objects because it exhibits a buoyant force equal to the difference in grams/mol. At room conditions (P = 1 atm, T = 25 degrees Celsius) what volume of helium would lift a pound?(A) 611 L(B) 37.3 L(C) 444 L(D) 2777 L
Chemistry
1 answer:
Mumz [18]3 years ago
6 0

Answer:

444 L

Explanation:

According to Archimedes the buoyancy force  is equal to the weight of the displaced substance. In this case, the displaced substance is Air. So to calculate the lifting power of Helium, start with the weight of air in volume

Since the Helium itself has weight, we need to use the difference in density between air and helium.

We know that the density of air is 1.2 kg/m^3

Density of Helium is 0.1787  kg/m^3

To lift a object of 1 pound  which is equal to 0.453 kg we need \frac{0.453}{1.2-0.1787}=0.444 m^3 helium There is 1000 liters in a m^3

So the required volume of helium= 0.444×1000=444 L

You might be interested in
If 3.2 moles of NaCl are dissolved in enough water to make a 0.98-liter solution, what is the molarity of the solution?
Dima020 [189]
Number of moles = 3.2 moles

Volume = 0.98 L

Therefore:

M = n / V

M = 3.2 / 0.98 => 3.3 M

Answer D

5 0
4 years ago
Read 2 more answers
Calculate the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L. Pl
vichka [17]

Answer: The concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n}{V_s}

where,

n = moles of solute

V_s = volume of solution in L

moles of Ca(OH)_2 = \frac{\text {given mass}}{\text {Molar mass}}=\frac{13.0g}{74g/mol}=0.18mol

Now put all the given values in the formula of molality, we get

Molarity=\frac{0.18}{5.0L}=0.036M

Therefore, the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M

8 0
3 years ago
Calculate the volume of dry CO2 produced at body temperature (37 ∘
ra1l [238]
Using the equation PV = nRT
Therefore; V = nRT / P
Need moles of glucose converted to moles of the product gas (CO2).

Molecular weight calculation:
C 6 X 12.01 = 72.06
H 12 X 1.01= 12.12
O 6 X 16.00 = 96.00
 sum = 180.18
25.5 g of C6H12O6 ( 1 mol C6H12O6 / 180.18 g) ( 6 mol CO2 / 1 mol C6H12O6) = 0.84915 mol CO2 gas.
Convert temp: 37 °C + 273.15 = 310.15 K
V= ((0.84915 mol)× (0.0821 L atm / mol K) (310.15 K))/0.980 atm
 V = 22.0635 L
  = 22.06 L CO2
7 0
3 years ago
Read 2 more answers
Which phrase best indicates the appropriate<br> audience?
kotegsom [21]
I don’t know the answer choices
8 0
3 years ago
8 Dry ice has the same chemical properties as what gas? А Helium B. Hydrogen C Nitrogen D Carbon dioxide 8 of 10​
aleksklad [387]

Answer:

D. Carbon Dioxide

Explanation:

i may be wrong, but i believe its carbon dioxide

8 0
3 years ago
Other questions:
  • This equation indicates that the reaction absorbs heat. What is this type of reaction called? H2O + heat → H2 + O2 A. an exother
    6·1 answer
  • How do plants dissolve rock?
    5·1 answer
  • Though there are many solids taking face-centered cubic unit cell, the number of solids adopting body-centered cubic unit cell d
    5·1 answer
  • The are of a rectangle is 12 in^2. what is the area in cm^2. there are 2.54cm in an inch.
    7·1 answer
  • Is water a stubstance
    11·2 answers
  • What is the ionic equation for the following<br> 2FeCl(aq)<br> 3Mg(s)<br> 3MgCl(aq)<br> 2Fe(s)
    10·1 answer
  • Gravity pulls all objects toward Earth's___
    9·1 answer
  • How many electrons do nonmetal atoms tend to gain when forming ions?
    12·2 answers
  • SCIENCE ASAP PLSSS
    9·1 answer
  • Two significance of melting point
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!