Molarity is moles divided by liters so do .732 divided by .975 liters.
Answer:
55.4g
Explanation:
Given parameters:
Number of atoms in the bottle = 8.34 x 10²²atoms
Unknown:
Mass of air in the bottle = ?
Solution:
The given specie is argon.
Molecular mass of Argon = 40g/mol
To find the mass of this Argon ;
Mass = number of moles x molecular mass;
Let us find the number of moles of the Argon;
6.02 x 10²³ atoms can be found in 1 mole of any substance
8.34 x 10²² atoms will give mole of Argon
= 0.139mole of Argon
So;
Mass of argon = 40g/mol x 0.139mole = 55.4g
Answer:
The alphabet comprises 21 consonants and 5 vowels
The first two answers are correct, but the last one is supposed to be 'molecule' not covalent bond <span />
Answer:
Explanation:
The first thing we need to do is to convert the wavelength to meters. We should remember that 1 meter is 1x10^9 nm so:
∧ = 150 nm / 1x10^9 nm = 1.5x10^-7 m
The formula for Energy in this case is:
E = hc/∧
We already know that c is the speed of light, which is 3x10^8 m/s and h is the planck constant which is 6.63x10^-34 J.s
Replacing data in the above formula:
E = 6.63x10^-34 * 3x10^8 / 1.5x10^-7 = 1.33x10^-18 J per photon.
Now finally to calculate the carbon atoms present in the sample, let's calculate the number of photons:
n° of photons = 1.98x10^5 / 1.33x10^-18
n° of photons = 1.49x10^23 photons
The exercise states that one atom emits on photon, so we can assume that this final result would be the number of carbon atoms present in the sample.