Refer to the attached document for the solution.
Answer:
Explanation:
In a desert cave, an artifact has been discovered. The anthropologists investigating this artifact want to determine its age. They note that the current activity level of the artifact is 9.25 decays/s, and the carbon mass present is 0.100 kg. To ascertain the artifact's age, they will employ specific constants:
r=1.2
The formula for carbon 14 activity is
where,
is the initial activity of the substance
Now, solve for t
since,
Thus, the age of the artifact is
to two significant figures = 6300 years
Answer: The Answer is A.
Explanation:
The energy of a photon is directly related to its electromagnetic frequency, meaning it is inversely related to the wavelength. A higher frequency results in greater energy for the photon. Conversely, a longer wavelength corresponds to lower energy levels.
Hope this Helps!
Density is calculated as mass divided by volume.
Step one:
Convert m³ to ml.
1 m³ = 1,000,000 ml
0.250 m³ x 1,000,000 = 250,000 ml
Step two: Convert mg to g.
1 mg = 0.001 g, hence 4.25 x 10^8 mg equals 0.459 g.
Consequently, the density comes out to be 0.459 g/250,000 = 1.836 x 10^-6 g/ml.
a) The completely balanced chemical reaction is:
Zn(s) + H2SO4(aq)
--------> ZnSO4(aq) + H2 (g)
<span>b) Initially, we determine the quantity of zinc that has reacted based on the produced H2.</span>
According to stoichiometry, 1 mole of Zn is required for each mole of H2 created, thus:
moles(Zn) = moles(H2)
where moles are calculated as the ratio of mass to molar mass (MM)
mass(Zn) / MM(Zn) = mass(H2) / MM(H2)
mass(Zn) = [mass(H2) / MM(H2)] * MM(Zn)
mass(Zn) = [(0.0764 g)/(2 g/mol)] * 65.38 g/mol
mass(Zn) = 2.49 g
Consequently, we find 2.49 g of pure zinc in the sample, leading to a purity of zinc of:
purity = (2.49 / 3.86) * 100 % = 64.50 %
<span>c) In part (b), it is assumed that the impurities in the sample do not react with sulfuric acid to emit hydrogen.
Thus, the hydrogen solely arises from the reaction of Zn with sulfuric acid.</span>
