Answer:
- Both energy and matter cannot be neither created nor destroyed.
- An equilibrium temperature will be reached.
Explanation:
Hello,
In this case, the law of conservation is applied to both matter and energy, and it states that both energy and matter cannot be neither created nor destroyed. Specifically, in chemical reactions, it states that in closed systems, the mass of the reactants equals the mass of the products even when the number of moles change. Moreover, for energy, if two substances at different temperatures come into contact, the hot one will cool down and the cold one will heat up until an equilibrium temperature so the energy lost by the hot one is gained by the cold one, which accounts for the transformation of energy.
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Answer:
the molar mass is 40 and the metal is Calcium
Explanation:
X + H2SO4=X2SO4 + H2
The mole ratio is 1:1
no of mole of H2SO4= conc(M) × Vol(L)
=0.1×0.5
=0.05 mol
from the balanced chemical equation of the reaction
no of mole of 'X' = no of mole of H2SO4
thus no of mole of X=0.05 mol
Also, no of mole=mass/molar mass
molar mass of 'X'=mol/mass
=2/0.05
=40
Answer:
The mass of oxygen gas dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air is 0.04936 grams.
Explanation:
Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.
To calculate the molar solubility, we use the equation given by Henry's law, which is:
where,
= Henry's constant =
= partial pressure of oxygen
We have :
Pressure of the air = P
Mole fraction of oxygen in air = 
= Henry's constant = 
Putting values in above equation, we get:
Moles of oxygen gas = n
Volume of water = V = 5 L
Mass of 0.001542 moles of oxygen gas:
0.001542 mol × 32 g/mol = 0.04936 g
The mass of oxygen gas dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air is 0.04936 grams.
The earths rotation. The earth rotates and as it rotates, the sun moves across the sky
The best way to express the concentration of a solution depends on the use of the information.
Some ways to express the concentration are: percent mass/mass, percen mass/volumen, percent volume/volume, ppm, molaritiy, molality, normality, mole fraction, among others.
If I am not going to perform a special chemical calculation (like pH or acid/base neutralization, or a colligative property) I'd probably rather to use percent mass/mass.
Percent mass/mass is an easy and intuitive way to understand how concentrated a solution is.
For example, it is easy for you to grasp that a 10% solution of NaCl has the double amount of salt than a 20% solution of NaCl.
But if you want to calculate a colligatiive property like the boiling point increase or freezing point depression of a solvent you need the molality of the solution.
And if you want to calculate the pH of a solution, you will need to know the molarity.
If you are working with very low concentrations, for example the amount of lead in a sample of a food ingredient, you'd rather work with ppm.
Each concentration measure has its own use.
