In the following reaction, what element is made?
2 answers:
Answer: The correct answer is option (A).
Explanation:
General representation of an element:
A= Atomic mass of the element of X.
Z = Atomic number of the element of X
X = symbol of the element.
According to Law of Conservation of Mass:
A = 244
Charge is balanced on both the sides:
Z = 97
The element with the atomic number 97 is Berkelium. Hence, the correct answer is option (A).
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Density of the gas is 3.05 × 10⁻³ g / cm³.
<u>Explanation:</u>
Volume of the cylinder = π r² h
where r is the radius and h is the height of the height or the length of the glass tube.
Here r = 4 cm and h = 27.4 cm
Volume of the cylinder = 3.14 × 4 × 4 × 27.4 = 1376.6 cm³
We have to find the mass of the gas by subtracting the mass of the tube filled with the substance from the mass of the empty tube.
Mass of the substance = 258.5 - 254.3 = 4.2 g
We have to find the density using the formula as,
Plugin the values as,
= 3.05 × 10⁻³ g / cm³
So the Density of the gas is 3.05 × 10⁻³ g / cm³.