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sergeinik [125]
3 years ago
14

Can anybody help me with this?

Chemistry
1 answer:
asambeis [7]3 years ago
4 0
In many ways, the Rutherford model of the atom is the classic model of the atom, even though it's no longer considered an accurate representation. Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths.

This model of an atom was developed by Ernest Rutherford, a New Zealand native working at the University of Manchester in England in the early 1900s. Rutherford spent most of his academic career researching aspects of radioactivity and, in 1908, won the Nobel Prize for his discoveries related to radioactivity. It was after this that Rutherford began developing his model of the atom.
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a 200 mL aqueous solution of ammonia has a concentration of 1.50 M. What mass of ammonia is dissolved in the solution?
sukhopar [10]

Answer: 51 grams

Explanation:

Ammonia is a gas with a chemical formula of NH3.

Given that,

Amount of moles of NH3 (n) = ?

Volume of NH3 (v) = 200mL

since the standard unit of volume is liters, convert 200mL to liters

(If 1000mL = 1L

200mL = 200/1000 = 0.2L)

Concentration of NH3 (c) = 1.5M

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

c = n / v

Make n the subject formula

n = c x v

n = 1.50M x 0.2L

n = 3 moles

Now, calculate the mass of ammonia

Amount of moles of NH3 (n) = 3

Mass of NH3 in grams = ?

For molar mass of NH3, use the atomic masses:

N = 14g; H = 1g

NH3 = 14g + (1g x 3)

= 14g + 3g

= 17g/mol

Since, n = mass in grams / molar mass

3 moles = m / 17g/mol

m = 3 moles x 17g/mol

m = 51 grams

Thus, 51 grams of ammonia was dissolved in the solution.

5 0
3 years ago
Which two are present in both waxes and sphingomyelin?.
Ilia_Sergeevich [38]

The compounds that are present in both waxes and sphingomylin are FATTY ACID AND LONG CHAIN ALCOHOL

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Zarrin [17]

Answer:

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Answer:

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Explanation:

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