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3 years ago

Given that oxygen has an atomic number of eight determine how many protons and neutrons are in the isotope 16O or oxygen -16

Chemistry

2 answers:

Andrej [43]3 years ago

8 0

Answer: Option (b) is the correct answer.

Explanation:

Atomic number is the sum of only total number of protons present in an element. Whereas mass number or atomic mass is the sum of total number of both protons and neutrons present in an element.

For example, given atom has atomic number is 8. And, it is known that atomic mass of O is 16 g/mol.

Therefore, number of neutrons present in it will be calculated as follows.

Mass number = no. of protons + no. of neutrons

16 = 8 + no. of neutrons

no. of neutrons = 16 - 8

= 8

Hence, we can conclude that in the given isotope of oxygen-16 there are 8 protons and 8 neutrons.

Natalija [7]3 years ago

3 0

8 protons and 8 neutrons

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Answer:

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Ca(In)²⁺ + EDTA → Ca(EDTA)²⁺ + In

We use the volume of EDTA consumed in the titration to calculate the moles of Ca⁺² ions:

0.012 L * 0.0600 M * $\frac{1molCa^{+2}}{1molEDTA}$ = 7.20x10⁻⁴ mol Ca⁺²

Now we calculate the molarity:

7.20x10⁻⁴ mol Ca⁺² / 0.050 L = 0.0144 M

To calculate in ppm, we use the moles of Ca⁺² and convert to mg of CaCO₃:

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7.20x10⁻⁴ mol CaCO₃ * 100g/mol * $\frac{1000mg}{1g}$ = 72 mg CaCO₃

Finally, the concentration in ppm is:

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2 years ago

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3 years ago