Explanation:
The rate at which gases effuse is inversely related to the square root of their molar masses.
In this case, half of the helium (1.5 L) passed through the membrane in 24 hours. Therefore, we can calculate the effusion rate of He gas as follows.
= 0.0625 L/hr
Given that the molar mass of He is 4 g/mol and for 
it is 32 g/mol.
Now,
= 2.83
Thus, the effusion rate of 
= 
Rate of = 0.022 L/hr.
This implies that 0.022 L of gas will effuse in one hour.
Consequently, to find the duration needed for 1.5 L of gas to effuse, we calculate as follows.
= 68.18 hours
Thus, we can conclude that it will require 68.18 hours for half of the oxygen to effuse through the membrane.
Answer:
Atoms consist of protons, neutrons, and electrons.
Explanation:
Dalton's atomic theory represented an early effort to describe atom properties. It maintained that atoms were the smallest indivisible elements of a substance and that chemical reactions happen through the joining or separation of atoms. All atoms of a single element were identical and distinct from those of other elements. The theory asserted that atoms can neither be created nor destroyed.
[[TAG_13]]With advancement in time, modern insights began to revise the initial tenets of Dalton's atomic theory, which did not include the notion that atoms were made of subatomic particles: electrons, neutrons, and protons. Previously, Dalton's view was that the atom was 'indivisible'. However, the electron was discovered by J.J. Thomson in 1897, leading to the later identification of protons and neutrons, indicating that atoms comprise even smaller components.[[TAG_14]]
Answer:
C. strands of hair discovered at the scene.
Explanation:
By utilizing the strands of hair, you can retrieve the DNA of the individual involved. This will provide a clearer lead in resolving the case.
I hope this information is helpful....
MgCO3---> MgO +CO2, x mol MgCO3
M(MgCO3)=24.3+12.0+48.0=84.3 g/mol
CaCO3--->CaO+CO2, y mol CaCO3
M(CaCO3)=40.0+12.0+48.0=100g/mol
M(CO2)=44.0
x*84.3 + y*100=24.00
x*44+y*44=12.00 x+y=12/44=0.2727, x=0.2727-y
(0.2727-y)*84.3 + y*100=24.00
22.99-84.3y+100y=24.00
22.99+15.7y= 24.00, 15.7y=1.01, y=0.06430 mol CaCO3
x=0.2727-0.06430=0.2084 mol MgCO3
0.06430 mol CaCO3*100g/mol=6.43 g CaCO3
0.2084 mol MgCO3*84.3g/mol=17.57 g MgCO3
what does it mean express your answer u?
Answer:
D. A base catalyst is needed.
E. An acid catalyst is also required.
F. Additionally, heat must be applied.
Explanation:
