The answer is B, the second choice
Answer:
0.2 moles of solute are in 200 mL
Explanation:
If we assume an aqueous solution, the solvent's density is 1g/mL
Solvent's volume = 200 mL
Solvent's density = Solvent's mass / Solvent's volume
Solvent's mass = solvent's density . solvent's volume → 200 mL . 1g/mL = 200 g
1 m means molality, we have 1 mol of solute in 1000 g of solvent, but in here the mass of solvent is 200 g. Let's make a rule of three:
1000 g of solvent have 1 mol of solute
Therefore, 200 g of solvent must have (200 .1) / 1000 = 0.2 moles
B Cus I’m hot the reason for this is my massive wille
Answer:
the enthalpy of the bond between chlorine and ozone is the 122,8 kj
Explanation:
Review Hess's Law
Inverse equation (1): Cl (g) + 2O2 (g) ==> Cl) (g) + O3 (g) ∆H = +122.8 kJ / mol (note change in sign of ∆H)
Copy equation (2): 2O3 (g) ===> 3O2 (g) ∆H = -285.3 kJ / mol
Add the 2 equations: 2O3 (g) + Cl (g) + 2O2 (g) ===> Cl)) g) + O3 (g) + 3O2 (g) and cancel common species
When you do this, you end up with the desired equation
Answer is: no, every sample does not have a negative charge.
Beside negatively charged electrons, atoms have positively charged protons, so atoms have neutral charge.
Atomic number is the number of protons, which is characteristic of a chemical element. For example, iron (Fe) is an element with atomic number 26, which means it has 26 protons and 26 electrons (in neutral atom, number of protons is equal to number of electrons).
The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.
Proton is a subatomic particle with a positive electric charge of +1e elementary charge.
