When electrons are removed from the outermost shell of a calcium atom the atom becomes?

Lysozyme extracted from chicken egg white has a molar mass of 13,930 g mo1-1. Exactly 0.1 g of this protein is dissolved in 50 g

Natalija [7]

Answer:

Relative lowering in vapor pressure of solution is 23.7599 mmHg.

Depression in freezing point of the solution is 0.0002667 K.

Elevation in boiling point of the solution is 0.0000745 K.

Osmotic pressure of the solution is 0.0035 atm.

Explanation:

1) Relative lowering in vapor pressure of solution containing non volatile solute is equal to the mole fraction of the solute.

$\frac{p^o-p_s}{p^o}=\frac{n_2}{n_1+n_2}$

$p^o$ = Vapor Pressure of the pure solvent

$p_s$ = Vapor Pressure of the solution

$n_2$ moles of solute

$n_1$ = moles of solvent

Given; $p^o=23.76 mmHg ,p_s=?$

Moles of Lysozyme = $n_2=\frac{0.1 g}{13,930 g/mol}=7.17\times 10^{-6} mol$

Moles of water = $n_1=\frac{50 g}{18 g/mol}=3.333 mol$

$\frac{23.76 mmHg-p_s}{23.76 mmHg}=\frac{7.17\times 10^{-6} mol}{3.333 mol+7.17\times 10^{-6} mol}$

$p_s=23.7599 mmHg$

2) Depression in freezing point $\Delta T_f$ is given by:

$\Delta T_f=K_f\times m$

$K_f$ = molal depression constant of solvent

m = molality of the solution = $\frac{moles}{\text{mass of solvent in kg}}$

$\Delta T_f=1.86 K kg/mol\times \frac{7.17\times 10^{-6} mol}{0.050 kg}$

$\Delta T_f=0.0002667 K$

3) Elevation in boiling point $\Delta T_b$ is given by:

$\Delta T_b=K_b\times m$

$K_b$ = molal elevation constant of solvent

m = molality of the solution = $\frac{moles}{\text{mass of solvent in kg}}$

$\Delta T_b=0.52 K kg/mol\times \frac{7.17\times 10^{-6} mol}{0.050 kg}$

$\Delta T_b=0.0000745 K$

4) Osmotic pressure of the solution $\pi$ is given as:

$\pi =cRT$

c = concentration of solution = $\frac{Moles}{Volume(L)}$

T = temperature of the solution

R = Universal gas constant = 0.0821 atm L/mol K

given , T = 298 K,

Mass of water = 50 g

Density of water = 1 g/ml

Volume of the water = $\frac{50 g}{1 g/mL}=50 mL=0.050 L$

$c=\frac{7.17\times 10^{-6} mol}{0.050 L}$

Since, there is less amount of solute in solvent volume of solution can be taken equal to the volume to the solution.

$\pi =\frac{7.17\times 10^{-6} mol}{0.050 L}\times 0.0821 atm L/mol K\times 298 K$

$\pi=0.0035 atm$

4 0

4 years ago

All of the following need to be present for a plant to do photosynthesis except

KonstantinChe [14]

Oxygen is a by-product of photosynthesis thus it is not needed for photosynthesis to occur.

Light is needed to provide the energy needed as photosynthesis is endothermic and is also needed to ionise the water molecule to get hydroxide and hydrogen ions and carbon dioxide is what is reduced to starch.

8 0

4 years ago

A reaction occurs in a calorimeter, resulting in the starting and final temperatures shown below. What can you say about the rea

ELEN [110]

"The reaction is exothermic and ΔH is negative" can be understood about the reaction and the enthalpy change (ΔH) during the reaction.

Option: D

Explanation:

When the reaction is positive, the process becomes endothermic, i.e. heat appears to be consumed by the system because the reaction products are more enthalpic than the reactants. When the reaction is negative, on the other hand, the process is exothermic, which is the total decrease in enthalpy is caused by heat production. Here the initial temperature is 21.0 C but increase in final temperature to 38.8 C, because if some processes require heat, others must give off heat when they take place.

4 0

4 years ago

1 mole of no2(g) has a greater entropy than 1 mole of n2o4(g). true or false

bija089 [108]

In order to answer this, you need to find the empirical data for the standard entropies. Please refer to this link: http://www.mrbigler.com/misc/energy-of-formation.PDF

For NO₂ gas, the entropy is 240 J/mol-K. For N₂O₄ gas, the entropy is 304.2 J/mol-K. Therefore, the statement is false.

7 0

3 years ago

Nadusha1986 [10]

Answer:

1 electron

Explanation:

These metals have a single electron in the outer shell

4 0

3 years ago