Volume of solute = 25 mL
Volume of solvent = 150 mL
% = ( volume of solute / volume of solvent ) x 100
% = ( 25 / 150 ) x 100
% = 0,166 x 100
= 16.6 % v/v
hope this helps!
To compute for the empirical formula, assume there is 100 grams of the compound. That means there is 40.28 g B, 52.2 g N and 7.53 g H. Convert the mass into moles using their molar masses:
40.28 g B * 1 mol/10.811 g = 3.725835 mol B
52.2 g N * 1 mol/14 g = 3.72857 mol N
7.53 g H * 1 mol/1 g = 7.53 mol H
Divide all the moles by the smallest amount which is 3.725835 mol.
B: 3.725835/3.725835 = 1
N: 3.72857/3.725835 = 1
H: 7.53/3.725835 = 2
Therefore, the empirical formula is BNH₂.
Answer:
Bronze is made of the metals copper and tin.
Explanation:
Bronze is stronger than copper as an outcome of combining that metal with tin or different ores. Bronze is more quickly dissolved and is hence more comfortable to cast. It is also harder than pure metal and considerably extra immune to corrosion.
Pure copper is soft and can be formed into wire or pounded into wanted shapes. If the copper is consequently warmed (tempered), it can be performed soft again. Copper and zinc are blended to create brass, and mixed with tin to produce bronze.
1) State the chemical reaction
4M + O2 ---> 2M2O
2) State the molar ratios
4 mol M : 1 mol O2 : 2 mol M2O
3) Calculate the number of moles of M2O produced
4 mol M / 2 mol M2O = 2 mol M / x => x = 2 mol M * 2 mol M2O / 4 mol M
=> x = 1 mol M2O
4) Calculate the molar mass of M2O
molar mass = mass in grams / number of moles = 62.0 g / 1 mol = 62.0 g/mol
5) Calculate the atomic mass of M
molar mass of M2O = 2 * atomic mass of M + atomic mass of O =>
62.0 = 2 * atomic mass of M + 16
=> atomic mass of M = [62.0 - 16] / 2 = 23
6) Compare that atomic mass with the atomic masses of the metals in the periodic table.
You will find that 23 is the atomic mass of sodium.
Answer: sodium
Answer is: (4) The frequency of collisions between atoms increases.
The average kinetic energy of molecules depends on the temperature.
As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.
Kinetic energy (standard unit is the joule J) depends on speed of the molecule.
Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:
V₁/T₁ = V₂/T₂.
When temperature goes up, the volume also goes up.