I believe the answer is: atomic number
Answer:
Sublimation and evaporation are similar in that they are both phase changes where a substance changes to a gas...but that's where the similarity ends. Sublimation comes from a solid changing to a gas, and evaporation is liquid changing to a gas.
Explanation:
The difference between phyisical and chemical change is the phyisical change is by nature and chemical change is by substance
Answer:
2.77 mol/kg
Explanation:
Molality is a sort of concentration that indicates the moles of solute in 1kg of solvent. In this case our solvent is water and, if we consider water's density as 1g/mL, we determine that the mass of solvent is 750 g.
We convert the mass to kg → 750 g . 1kg /1000g = 0.750 kg
Our solute is the NaOH → 83 g.
We convert the mass to moles → 83 g . 1mol /40g = 2.075 mol
Molality (mol/kg) = 2.075 mol / 0.75kg = 2.77 m
Answer: The mass of produced is, 149 grams.
Explanation : Given,
Mass of = 354.2 g
Molar mass of = 278 g/mol
Molar mass of = 58.5 g/mol
First we have to calculate the moles of
Now we have to calculate the moles of
The balanced chemical equation is:
From the reaction, we conclude that
As, 3 moles of react to give 6 mole of
So, 1.27 moles of react to give mole of
Now we have to calculate the mass of
Therefore, the mass of produced is, 149 grams.