0.2701 moles of water were evaporated from the sample by the heating process
Mass of evaporating dish = 8.365 g
mass of dish + hydrate = 18.597 g
mass of hydrate = (mass of dish + hydrate) - mass of dish
hydrate = 18.597 - 8.365 = 10.232 g
Mass of dehydrated material = (mass of dish + dehydrate ) - mass of dish
dehydrated material = 18.735 - 8.365 = 5.37 g
Mass of water evaporated = hydrate - dehydrate
mass of water = 10.232 - 5.37 = 4.862 g
Molar mass of water = 18 gm/mol
no. of moles of water evaporated = mass / molecular mass
moles = 4.862/18 = 0.2701 moles
To learn more about mole click here:
brainly.com/question/29367909
#SPJ4
Answer:
Explanation:
Molal freezing point depression constant of butanol Kf = 8.37⁰C /m
ΔTf = Kf x m , m is no of moles of solute per kg of solvent .
mol weight of butanol = 70 g
235.1 g of butanol = 235.1 / 70 = 3.3585 moles
3.3585 moles of butanol dissolved in 4.14 kg of water .
ΔTf = 8.37 x 3.3585 / 4.14
= 6.79⁰C
Depression in freezing point = 6.79
freezing point of solution = - 6.79⁰C .
Nuclear energy is harmful because it releases of harmful ionizing radiation and has been employed in the production of atomic bombs and hydrogen bombs.
Nuclear energy is beneficial in that it produces vast amount of energy for domestic and industrial purposes.
<h3>What is nuclear energy?</h3>
Nuclear energy refers to the energy which is produced as a result of the changes that occur in the nucleus of atoms of elements.
Nuclear energy produces the largest amount of energy when compared to other forms of energy sources.
Nuclear energy is produced by two types of nuclear reactions:
- Nuclear fission and Nuclear fusion
Nuclear energy is harmful in that it results in the release of harmful ionizing radiation which damages cells and tissues of living organisms.
Nuclear energy is also harmful because nuclear energy has been employed in the production of atomic bombs and hydrogen bombs.
On the other hand, nuclear energy is beneficial in that it produces vast amount of energy which can be used for domestic and industrial purposes. It also produces fewer wastes that damage the environment compared to fossil fuels.
In conclusion, nuclear energy is both beneficial and harmful.
Learn more about nuclear energy at: brainly.com/question/15214614
#SPJ1
Answer is: concentration is 1.3 ppm.
Parts-per-million (10⁻⁶) is present at one-millionth of a gram per gram of sample solution, for example mg/kg.
d(Cu) = 0.0013 g/L; mass concentration of copper.
d(H₂O) = 1.00 g/mL; density of water.
m(H₂O) = V(H₂O) · d(H₂O).
m(H₂O) = 1000 mL · 1 g/mL.
m(H₂O) = 1000 g ÷ 1000 g/kg.
m(H₂O) = 1 kg; mass of water.
m(Cu) = 0.0013 g · 1000 mg/g.
m(Cu) = 1.3 mg; mass of coppper.
concentration = 1.3 mg ÷ 1 kg.
concentration = 1.3 mg/kg.
concentration = 1.3 ppm.
B reactants then C is on the right side! If you take h2O and air (the reactants) then the product would be a snowflake. happy holidays!!
