Heat of fusion is <span>the </span>heat<span> absorbed by a unit mass of a given solid at its </span>melting<span> point that completely converts the solid to a liquid at the same temperature. We use this concept to calculate the mass of copper. We do as follows:
H = m(Hfus)
112.4 = m (13.0) ( 1 mol / 63.55 g )
m = 549.4631 g -------> OPTION 3</span>
To determine the formula mass of beryllium chloride, BeCl₂, we start up with the basis of one mole first.
Basis: 1 mole BeCl₂
To determine the molar mass of BeCl₂, we add up the mass of one mole of beryllium and two moles of chlorine.
1 mol Be = 9 g/mol
1 mol of Cl = 35.45 g/mol
Solving,
molar mass of BeCl₂ = (1 mol Be)(9 g/mol) + (2 mols Cl)(35.45 g/mol)
molar mass of BeCl₂ = 79.9 g
Then, we take into consideration that 1 mol is equal to 6.022 x 10²³ formula units.
formula mass BeCl₂ = (79.9 g/mol)(1 mol/6.022 x 10²³ formula units)
formula mass of BeCl₂ = 1.33 x 10⁻²² g/formula unit
<em>Answer: 1.33 x 10⁻²² g/formula unit</em>
Answer:
Heating is the best method
Explanation:
When a mass of crystals containing Water of crystallization is heated sufiiciently to a high temperature, water vapor may be driven off the crystals by the action of heat alone.
Answer:
Explanation:
First you should calculate the volume of a big sphere,so:
Then you calculate the volume of a small spehre, so:
Finally you subtract the two quantities: