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2 years ago

Is (NH4)2 a ionic compound

Chemistry

1 answer:

nikitadnepr [17]2 years ago

5 0

No it's not. It has covalent bonds because the elements are both non-metals.

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A solution made by dissolving 33 mg of insulin in 6.5 mL of water has an osmotic pressure of 15.5 mmHg at 25°C. Calculate the mo

Liula [17]

Answer: The molar mass of the insulin is 6087.2 g/mol

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

Or,

$\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT$

where,

$\pi$ = osmotic pressure of the solution = 15.5 mmHg

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (insulin) = 33 mg = 0.033 g (Conversion factor: 1 g = 1000 mg)

Volume of solution = 6.5 mL

R = Gas constant = $62.364\text{ L.mmHg }mol^{-1}K^{-1}$

T = temperature of the solution = $25^oC=[273+25]=298K$

Putting values in above equation, we get:

$15.5mmHg=1\times \frac{0.033\times 1000}{\text{Molar mass of insulin}\times 6.5}\times 62.364\text{ L.mmHg }mol^{-1}K^{-1}\times 298K\\\\\text{molar mass of insulin}=\frac{1\times 0.033\times 1000\times 62.364\times 298}{15.5\times 6.5}=6087.2g/mol$

Hence, the molar mass of the insulin is 6087.2 g/mol

8 0

2 years ago

If two objects have the same mass, what must be true? choose the correct answer A. They have the same volume B. They are made of

Nataly_w [17]

C. Mass is kind of like a measurement of matter.

7 0

3 years ago

Read 2 more answers

What happens to an electron during an electron transition?

ICE Princess25 [194]

I think the answer is d not real fir sure I'll find out in the morning sorry

4 0

3 years ago

. how many lone pairs of electrons are present in the lewis structure of calcium sulfide?

miv72 [106K]

Answer:
Four

Explanation:
Calcium Sulfide is an ionic compound made up of Ca²⁺ and S²⁻.
Ca²⁺ is formed as,

Ca → Ca²⁺ + 2 e⁻

These two electrons are accepte by Sulfur as,

S + 2 e⁻ → S²⁻

So, before accepting 2 electrons S was having six valence electrons, after accepting two electrons from Ca it has 8 electrons which are present in four pairs as shown below,

7 0

3 years ago

What feature of a chemical equation is used to balance the equation and make sure it obeys the law of conservation of mass?

taurus [48]

Answer:

b) coefficient

Explanation:

Refer to this example:

CH4 +2 O2 → CO2+ 2 H2O

2 is used as a coefficient in this chemical equation.

5 0

2 years ago

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