How many atoms are in 365 grams of CaCl2

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as

evablogger [386]

For the answer to the question above, The formula for freezing point depression is 
ΔTf = mkfi 

kf is the freezing point constant 
i is the Van't Hoff factor which in this case is 1 
m is molality (moles of solute/kg of solvent) 
ΔTf is temperature change 

ΔTf is 2.17 °C, the molality is the amount of solute Quinine 
in the solvent cyclohexane. We cannot calculate moles therefore we need to substitute moles with g/mm. 

moles = g/mm so molality=(g/mm)/kg 
molality = (0.845/mm)/0.025 = 33.8/mm 

2.17 = 33.8/mm(20.8) rearrange 

mm = (33.8/2.17)(20.8) = 324g/mol

5 0

2 years ago

you drop a marble ball into a glass filled with water, which results ib 3.75 mL of water being displaced (spilled out). given th

erica [24]

Answer:- Density is 2.54 gram per mL.

Solution:- $density=\frac{mass}{volume}$

Mass of the marble ball is given as 9.513 g and it's volume is 3.75 mL.

To calculate the density of the marble ball let's plug in the values in the formula:

$density=\frac{9.513g}{3.75mL}$

$density=2.54\frac{g}{mL}$

So, the density of the marble ball is 2.54 gram per mL.

7 0

3 years ago

Bella observes that the gas-filled tire of her bicycle becomes a little deflated when she keeps the bicycle outside in cold weat

weqwewe [10]

The low temperature outside lowers the volume of the gas according to Charles' law because this law describes how a gas will behave at constant pressure. It shows that the volume of a given mass of a gas is directly proportional to the absolute temperature provided the pressure remains constant. An increase in temperature leads to an increase in volume while a decrease reduces the volume. This is due to the reduction in the distances traveled by the vibrating particles of the gas because of the lost kinetic energy.

5 0

3 years ago

A 15.0-L scuba diving tank contains a helium-oxygen (heliox) mixture made up of 23.0 g of He and 4.14 g of O2 at 298 K. Calculat

EleoNora [17]

Answer: The mole fraction of Helium is 0.978 and that of oxygen gas is 0.022

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)