Select the atoms that belong to the same element
2 answers:
<u>Answer:</u> The atoms which belong to the same element are atom 2 and atom 5.
<u>Explanation:</u>
Elements are identified by their atomic numbers.
Atomic number is defined as the number of protons or number of electrons that are present in an element.
Atomic number = Number of protons = Number of electrons
Two atoms having same number of protons will belong to same element.
From the given image, atom 2 and atom 5 have same number of protons which are 11.
Thus, both the atoms belong to same element.
Hence, the correct answer is atom 2 and atom 5.
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Answer:
The correct answer is option d.
Explanation:
..[1]
..[2]
moles of sodium thiosulfate solution = n
Molarity of the sodium thiosulfate solution = 0.150 M
Volume of sodium thiosulfate solution used = 0.890 mL = 0.00089 L
According to reaction [2], 2 moles of sodium thiosulfate reacts with 1 mol .
Then , 0.0001335 mol of sodium thiosulfate will reacts with:
of
Moles of = 0.00006675 mol
According to reaction [1], 1 mol of is obatnied from 1 mol of NaClO.
Then 0.00006675 mol of will be obtained from:
Mass of 0.00006675 mol of NaClO=
0.00006675 mol × 74.44 g/mol = 0.00496887 g
Mass of sample = 0.0854 g
Percentage of NaClO in sample: