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adoni [48]
3 years ago
6

How many grams of NaCl should be added to 250 grams of waterto make a 0.40 m solution?

Chemistry
1 answer:
brilliants [131]3 years ago
7 0

Answer:

5.85 grams of NaCl should be added to 250 grams of water to  make a 0.40 m solution.

Explanation:

molality=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{ Mass of solvent (kg)}}

Mass of NaCl =x

Molar mass of NaCl = 58.5 g/mol

Molality of the solution = 0.40 m

Mass of the solvent = 250 g = 0.250 kg (1g = 0.001 kg)

0.40 m=\frac{x}{58.5 g/mol\times 0.250 kg}

x=0.40 m\times 58.5 g/mol\times 0.250 kg=5.85 g

5.85 grams of NaCl should be added to 250 grams of water to  make a 0.40 m solution.

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an atom has a charge of -3 in its orbitals which statement must be true in order for this atom to have no net charge
NISA [10]

Answer:

The atom must lose its three extra electrons to make the atom over all neutral.

Explanation:

The three subatomic particles construct an atom electron, proton and neutron. 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.

If an atom have -3 charge it means three more electrons are added. In order to make the atom overall neutral three more electrons must be removed so that negative and positive charge becomes equal and cancel the effect of each other and make the atom neutral.

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e⁻

Mass= 9.10938356×10⁻³¹ Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

Proton and neutron:

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P⁺

Symbol of neutron= n⁰

Mass of proton=1.672623×10⁻²⁷ Kg

Mass of neutron=1.674929×10⁻²⁷ Kg

7 0
3 years ago
What are the reference points in thermometer with Celsius scale?
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I hope this helps.  Let me know if anything is unclear. 
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Answer:

i think it's a (not sure)

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Answer and Explanation:

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