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2 years ago

To find the number of neutrons in To find the number of neutrons in and you would subtract

Chemistry

1 answer:

givi [52]2 years ago

6 0

Answer:

To find the number of neutrons we would subtract the number of protons from mass number of an atom.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example:

The mass number of carbon is 12 amu and it has six protons thus to find the number of neutrons we would subtract the 6 from 12 and get number of neutrons.

12- 6 = 6 neutrons

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3 years ago

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3 years ago

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3 years ago

Which one of the following Acids is most likely to hurt you? Acid A: 1.0 M; Acid B: 0.0001M

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3 years ago

A mixture of MgCl2 and NaCl has an initial mass of 0.4015 g. Excess AgNO3(aq) was added and 1.032 g of precipitate, AgCl(s), was

zlopas [31]

Answer:

8.909*10^-4 moles

Explanation:

The mixture contains MgCl $_{2}$ and NaCl with a total mass of 0.4015 g. The mass of precipitate AgCl(aq) is 1.032 g and it has a molar mass of 143.32 g/mol. Therefore, the moles of the precipitate is:

n = 1.032/143.32 = 7.2007*10^-3 moles

Molar mass of NaCl = 58.44 g/mol and the molar mass of MgCl $_{2}$ is 95.21 g/mol. Let the mass (g) of MgCl $_{2}$ in the original mixture be 'x'. Thus:

7.2007*10^-3 = (0.4015-x)/58.44 + 2x/95.21

(7.2007*10^-3)*58.44*95.21 = 95.21(0.4015-x) + 2x(58.44)

40.06505 = 38.227 -95.21x + 116.88x

40.06505 - 38.227 = -95.21x + 116.88x

1.83805 = 21.67x

x = 1.83805/21.67 = 0.0848 g

moles of MgCl $_{2}$ = 0.0848g/95.21 g/mol = 8.909*10^-4 moles

4 0

3 years ago