Answer:
a) 31 g
b) 0.867, 0.132
c) 86.75%, 13.24%
Explanation:
Given:
Mass of the sample of galena = 234 g
Mass of the lead in the sample = 203 g
Now,
galena = sulfur + lead
thus,
a) Mass of the sulfur will be calculated as:
= mass of the sample of galena - mass of lead
on substituting the values, we have
= 234 - 203
or
= 31 g
b) Now,
the mass fraction of lead will be calculated as = ( mass of lead) / (total mass of the galena sample)
= 203/234 = 0.867
and,
Mass fraction of sulfur will be = ( mass of the sulfur in the sample) / ( total mass of the sample)
thus we have
= 31/234
⇒ 0.132
(c) Now the mass percentage of lead in the sample = (mass of lead in the sample ) / (total mass of sample) × 100%
= (203 / 234) x 100%
= 86.75%
and
the mass percentage of sulfur in the sample = ( mass of sulfur in the sample ) / (total mass of the sample) × 100%
= (31 / 234) × 100%
⇒ 13.24%
N(CaCO3)=m÷M
m being the mass of the sample and M being the molar mass of the compound; Molar mass is to be obtained by adding the atomic masses of all the elements in the compound.
therefore,
n(CaCO3)=m÷M
=28g÷100 g.mol
=0.28 mol
therefore, there are 0.28 moles in 28g of Calcium Carbonate.
The wavelength of a photon is 622nm and it is a red light.
<h3>What is Wavelength?</h3>
The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimetres (cm), or millimetres (mm) in wireless systems (mm).
<h3>What is Photon?</h3>
A discrete bundle (or quantum) of electromagnetic (or light) energy is referred to as a photon. Photons move at the speed of light (3 108 m/s) because they have no mass.
<h3>What are the calculations?</h3>
λ = v/f
where, f = frequency = 4.82 ×
v = speed of light = 3 × m/s
λ = 3 × / 4.82 ×
λ = 6.22 ×
λ = 622 nm.
Hence, the wavelength of a photon is 622nm and it is red light.
To know more about Wavelength, check out:
brainly.com/question/10750459
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Answer:
362,5J
Explanation:
formula for calculating Gravitational Potential Energy is mass×gravitational field strength ×height
12.5×10×2.9=362,5J