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3 years ago

Determine the percent Ammonia, NH3 in Co(NH3)6Cl3, to three significant figures.

Chemistry

1 answer:

dusya [7]3 years ago

6 0

Answer: Percent ammonia in $Co(NH_3)_6Cl_3$ is 38.2 % in 3 significant figures.

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

$\text{Mass percent of ammonia}=\frac{\text{Mass of ammonia}}{\text{Molar mass of}Co(NH_3)_6Cl_3}\times 100$

Molar mass of $Co(NH_3)_6Cl_3$ = 267 g/mol

Mass of $NH_3$ = $6\times 17g/mol=102g$

Thus $\text{Mass percent of ammonia}}=\frac{102}{267}\times 100=38.2\%$

Thus percent ammonia in $Co(NH_3)_6Cl_3$ is 38.2 % in 3 significant figures.

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Answer:

C. 0.4.

Explanation:

∵ mole fraction of acetic acid (X acetic acid) = (no. of moles acetic acid)/(total no. of moles) = (no. of moles acetic acid)/(no. of moles of acetic acid + no. of moles of water).

- no. of moles of acetic acid = 2, no. of moles of water = 3.

- Total no. of moles = no. of moles of acetic acid + no. of moles of water = 2 + 3 = 5.

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3 years ago

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mr Goodwill [35]

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4 years ago

12. Which neutral atom would most likely form an ion with a 3- charge?

melamori03 [73]

Answer:

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Explanation:

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3 years ago

you have two solid substances that look the same. what measurements would you take and what tests would you perform to determine

andreev551 [17]

The easiest way to go about this would be to check out their physical properties. Physical properties are those attributes of a substance or material that can be observed or measured without altering or changing the composition of that material.

So we can check out the following physical properties:

1. Color. Check if there is any difference in color.

2. Weight. If possible, take similar sized pieces of the two and note any difference in weight .

3. Texture. Are they smooth or rough to the touch?

4. Smell or odor. Check out any unique smell.

5. Solubility. Dissolve a bit of each in water and see how soluble each is.

6. Melting point. Carefully heat a piece of it and see if they will melt, and if so at what temperature.

7. Pliability. Can any of them bend, are they flexible?

8. Magnetism. Can the be attracted by a magnet?

9. Bouyancy . Can they float on water?

10. Electrical conductivity. using a battery and small torch bulb, find out if they can conduct an electric current.

These 10 physical tests can help differentiate between the two materials. There are still many more that can be safely carried out.

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3 years ago

1.00 mole of oxygen at 60 degrees celcius and 5 bar is flowing through a 20cm diameter pipe (inner diameter). What is the veloci

jeka94

Answer:

u = 0.176 m/x

Explanation:

∴ n O2 = 1 mol

∴ mass O2 = 1 mol * 32 g/mol = 32 g

∴ T = 60°C = 333 K

∴ P = 5 bar

⇒ V = RTn/P = (83.14 bar.cm³/mol.K)*(333 K)*(1 mol))/(5 bar)

⇒ V = 5537.124 cm³

∴ d = 20cm

⇒ A = (1/4π)*d² = 314.16 cm²

velocity of the gas (m/x):

u = m / ρ*A
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∴ ρ = 32 g / 5537.124 cm³ = 5.78 E-3 g/cm³

∴ mass flow rate (m) = 32g / x

⇒ u = (32 g/x) / (( 5.78 E-3 g/cm³)*(314.16cm²))

⇒ u = 17.625 cm/x * ( m/100cm) = 0.176 m/x

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3 years ago