Y⃨E⃨S⃨ In general, atoms are most stable, least reactive, when their outermost electron shell is full. Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule.
Red blood cells are red because they contain Haemoglobin
Answer:
173.5 g
Explanation:
This question seems incomplete, as the power by which 10 is increased is missing. I will answer this question assuming the given number of molecules is <em>7.03x10²³ </em>molecules. A different number of molecules will give a different answer, but the procedure remains the same.
First we <u>convert the given number of molecules into moles</u>, using <em>Avogadro's number</em>:
- 7.03x10²³ molecules ÷ 6.023x10²³ molecules/mol = 1.17 mol
Then we <u>convert magnesium nitrate moles into grams</u>, using its <em>molar mass</em>:
- 1.17 mol * 148.3 g/mol = 173.5 g
The osmotic pressure of a solution made from 12.5 g of CaCl2 in enough water to make 500 mL, if CaCl2 is 78.5% dissociated at 30oC is 167.087 atm
<h3>
Define osmotic pressure:-</h3>
Osmotic pressure and osmosis are connected. Osmosis is the passage of a solvent through a semipermeable membrane into a solution. The pressure that halts the osmosis process is known as osmotic pressure. Osmotic pressure is a collective attribute of material because its value is determined by the solute's concentration rather than its chemical composition.
The formula used to calculate Osmotic Pressure is:-
π = M x R x T x i
Where;
π =osmotic pressure (in atm)
M=molar concentration (in mol/L)
=(given mass/molar mass)/volume=(12.5g /111.0)/(500/1000)
=0.224 mol/L
R=Universal gas constant (0.08206 L.atm/mol.K)
T=absolute temperature (in K) = 30.C + 273 = 303 K
i= van't Hoff factor of solute =3
using the formula and substituting values;
π=0.224 x 0.08206 x 303 x 3
= 167.087 atm
The osmotic pressure is 167.087 atm
Learn more about osmotic pressure here:-
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Answer:
water and air
Explanation:
The examples of medium from this problem is water and air.
A medium is an agency or a means of propagating energy, waves or even facilitating a chemical reaction.
Fluids are very good medium in chemistry for chemical reactions. The two most common media used are air and water.
In physics, a vacuum is an empty space that has been evacuated. It also serves as a medium to study some physical phenomenon.