Theyre the big bunched up group in the middle of the periodic table
Answer:
146 g/mol → option b.
Explanation:
This is a problem about the freezing point depression. The formula for this colligative property is:
ΔT = Kf . m . i
We assume i = 1, so our compound is not electrolytic.
ΔT = Freezing T° of pure solvent - Freezing T° of solution = 1.02 °C
m = molality (mol of solute/kg of solvent)
We convert the grams of solvent (benzene) to kg → 250 g . 1 kg/1000 = 0.250 kg.
We replace → 1.02°C = 5.12°C/mol/kg . mol/ 0.250kg . 1
1.02°C / 5.12 mol/kg/°C = mol/ 0.250kg
0.19922 mol/kg = mol/ 0.250kg
mol = 0.19922 . 0.250kg → 0.0498 mol
molar mass = g/mol → 7.27 g / 0.0498mol = 146 g/mol
Answer:
Hydrogen's location is related to it's electron configuration not it's properties.
Even though hydrogen is gas it can be used as fuel in automobile because it is flammable
On a molecular level, water which was H2O can be divided into H+ and OH- ion. Therefore, water has an acid component which was H+ and a base component which was OH-. The water is at neutral pH of 7 not because there are no acid and base, but because the amount of acid and base is equal.
