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4 years ago

In which solution might a cell maintain homeostasis through diffusion?. . A isotonic. B hypertonic. C hypotonic. D concentrated

1 answer:

7 0

A as if the cell is placed in a solution with the same solute and water potential as it no water moves in nor out so the cells remains in homoeostasis

hope that helps

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What mass of limestone (in kg) would be required to completely neutralize a 15.5 billion-liter lake that is 1.7×10^−5 M in H2SO4

Alinara [238K]

The complete balanced chemical reactions are:

HNO3 => CaCO3 + 2HNO3 → Ca(NO3)2 + H2O + CO2(g)

H2SO4 => CaCO3 + H2SO4 → CaSO4 + H2O + CO2(g)

So we see that 1 mole of CaCO3 is needed for 2 moles of HNO3 and similarly to 1 mole of H2SO4.
The number of moles can be calculated as the product of volume and molarity, so:

moles H2SO4 = 1.7×10^−5 M * (15.5 x 10^9 L) = 263,500 mol H2SO4

moles HNO3 = 8.9×10^−6 M * (15.5 x 10^9 L) = 137,950 mol HNO3

So the total moles of CaCO3 required is:

moles CaCO3 = 263,500 mol * 1 + 137,950 mol * (1/2)

moles CaCO3 = 332,475 mol

The molar mass of CaCO3 is 100.086 g/mol, so the mass is:

mass CaCO3 = 332,475 mol * 100.086 g/mol

mass CaCO3 = 33,276,092.85 g = 33.3 x 10^3 kg

5 0

4 years ago

A 255 mL round--bonom flask is weighed and found to have a mass of 114.85 g. A few millimeters of an easily vaporized liquid are

Alex17521 [72]

Answer: Option (d) is the correct answer.

Explanation:

According to the given situation, mass of compound will be calculated as follows.

Mass of compound = mass of flask and condensed vapor - mass of flask

= 115.23 - 114.85

= 0.38 g

Volume (V) = 255 mL = $255 \times 10^{-6} m^{3}$ (as 1 ml = $10^{-6} m^{3}$ )

Pressure (P) = 101325 Pa

Temperature = $100^{o}C$ = (100 + 273) K = 373 K

Now, according to the ideal gas equation, PV = nRT

and, moles of compound n = $\frac{PV}{RT}$

= $\frac{101325 \times 255 \times 10^{-6}}{8.314 \times 373}$

= 0.008332 mol

As, molar mass of compound = $\frac{mass}{\text{no. of moles}}$

= $\frac{0.38}{0.008332}$

= 46 g/mol

Therefore, the compound is $C_{2}H_{5}OH$ (molar mass = 12 x 2 + 5 x 1 + 16 + 1 = 46 g/mol).

Thus, we can conclude that out of the given options the liquid could be $C_{2}H_{5}OH$ .

4 0

3 years ago

Which of these is an example of solar energy?

nataly862011 [7]

A) heating a pot of water on a stove

5 0

4 years ago

Read 2 more answers

sort these into metals and non-metals. Apperence, density, strength, malleable, brittle, conductor, sonorous, ductile.

77julia77 [94]

Answer:

Metals and non-metals are substances that can be differentiated on the basis of various physical and chemical properties. Metals are the elements that are generally hard as strong metallic bond exists between the atoms. As against non-metals are the elements which are usually soft.

7 0

3 years ago

Using what you know about the structures of the amino acid side chains and the mechanisms presented in this chapter, which of th

Lostsunrise [7]

Answer:

a. participate in proton transfer - His

b. acts as a nucleophile - Ser

Explanation:

Enzymes are regulated because they are proteins. They are categorize based on how they catalyze. Heat weakens and inactivates the enzymes because of non covalent interaction. His amino acid participate in proton transfer because it is able to act as an acid as well as a base while Ser amino acid can act as nucleophile.

8 0

3 years ago