What is the steric number of H2O2?

The molecular weight of an organic compound was determined by measuring the freezing point depression of a benzene solution. A 0

Rudiy27

Answer: The molar mass of the sample is 120.6 g/mol

Explanation:

To calculate the depression in freezing point, we use the equation:

$\Delta T_f=iK_fm$

Or,

$\Delta T_f=i\times K_f\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}$

where,

$\Delta T_f$ = depression in freezing point = 0.42°C

i = Vant hoff factor = 1 (For non-electrolytes)

$K_f$ = molal freezing point elevation constant = 5.065°C/m

$m_{solute}$ = Given mass of solute (sample) = 0.500 g

$M_{solute}$ = Molar mass of solute (sample) = ? g/mol

$W_{solvent}$ = Mass of solvent (benzene) = 50.0 g

Putting values in above equation, we get:

$0.42^oC=1\times 5.065^oC/m\times \frac{0.500\times 1000}{M_{solute}\times 50.0}\\\\M_{solute}=\frac{1\times 5.065\times 0.500\times 1000}{50.0\times 0.42}=120.6g/mol$

Hence, the molar mass of the sample is 120.6 g/mol

5 0

4 years ago

Someone pls help me I will make you brain

I am Lyosha [343]

Answer:

i think b or c

Explanation:

one of the 2. (btw i use flvs to so i dont blame u for being confused)

5 0

2 years ago

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Wheen 56j of heat are added to 11g of liquid, its temperature rises from 10.4 degrees celsius to 12 degrees celsius. What is the

svetoff [14.1K]

$c = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}$

Energy change $Q = 56 \; \text{J}$
Mass being heated $m = 11 \; \text{g}$
Temperature change $\Delta T = 12 - 10.4 = 1.6\;^{\text{o}}\text{C}$ which is the same as $1.6 \;\text{K}$ .

Heat capacity measures the energy required to raise the temperature of a unit mass of a substance by a unit degree. Therefore

$c = Q / (m \cdot \Delta T) = 56/(11 \times (12 - 10.4)) = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}$

7 0

4 years ago

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A graduated cylinder is filled 241.5 ML with water and a piece of granite is placed in the cylinder displacing the level 247.6 M

NikAS [45]

Answer:

6.1 cm³

Step-by-step explanation:

Cylinder + water + granite = 247.6 mL

-(Cylinder + water) = 241.5 mL

Granite = 6.1 mL

1 mL = 1 cm³, so

Volume of granite = 6.1 cm³

3 0

3 years ago

Electrolytes are defined as those compounds which: have covalent bonding produce less lowering at the freezing point than do com

Fofino [41]

Answer:

Electrolytes are defined as those compounds which dissolve in a solvent such as water to produce a solution which conducts electric current easily.

Explanation:

Electrolytes are chemical compounds that dissolve in a solvent such as water and dissociate into ions (cations and anions) which helps to conduct electric current. They can be solids, liquids, or solutions and examples include all ionic compounds such as sodium chloride, calcium chloride, etc.

When electrodes are placed in a solution containing an electrolyte, the ions produced in the solution move from one electrode to the other. The negatively charged ions called anions are attracted to the positive electrode and the positively charged ions called cations are attracted to the negative electrode. This movement of ions generates an electric current. Electrolytes are also needed for the various electrochemical processes in living things and the main ions in these electrolytes are sodium (Na+), calcium (Ca2+), potassium (K+), magnesium (Mg2+), chloride (Cl-), etc.

4 0

3 years ago

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