Answer:
CO2 molecule is made up of Carbon (atomic mass =12) and oxygen (atomic mass=16).
So first finding the mass of 1 molecule of CO2 which is equals to
= mass of 1 carbon atom + masses of 2 oxygen atom, we get
= 12+(16*2)= 12+32= 44 a.m.u.
Now 1 molecule of CO2 has mass 44 amu so mass of 1 mole CO2 will be 44 grams.( 1 a.m.u.=1.6729*10^-33 grams. 1 mole = 6.022*10^23, so 44 a.m.u.=73.6076*10^-33 grams approx. For one mole CO2, 73.6076*10^-33*6.022*10^23 which is approximately equals to 44 grams. )
1 mole CO2= 44grams, so 2.5 moles = 44*2.5= 110 grams
So our answer is 110 grams
Answer:
e) 160,000 years from now.
Explanation:
The distance of the supergiant from us is
d = 150,000 light years
This means that the light emitted by the star takes 150,000 years to reach us.
We are told that the star will become a supergiant in
t = 10,000 years
from now. When this will happen, the light from the supernova will not reach us instantaneously, but it will take 150,000 years to travel the distance between us and the star.
Therefore, the supernova will be visible on Earth only after:
T = 10,000 y + 150,000 y = 160,000 years
So, option E) is correct.
Answer:
False
Explanation:
The mass of something does not depend on gravity. A planet has a constant gravitational force. Earth's is 9,80 N/kg. The moon, on the other hand, is 1,6 N/kg. the number of kilograms of something doesn't change if you go from one planet to another and since mass is measured in kilograms, mass doesn't change, therefore it does not refer to gravity. Mass refers to the quantity of matter in an object. It is weight that refers to the gravitational force on an object, since it is measured in newtons, and the amount of newtons per kilogram changes from planet to planet due to different gravity constants
Answer:
668 bright fringes
Explanation:
t = Thickness = 0.2 mm
= Wavelength = 600 nm
m = Number of fringes
We have the fringe width relation
So, total number of fringes will be including m = 0 is