Answer:
Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.
Explanation:
The additional volume of HCl which must be added to reach to the equivalence point is 8.33 mL
The moles of HCl which is required to reach the equivalence point can be calculated in the way as follows.
Moles of HCl can be calculated as
Moles of HCl = 0.004 moles of Ca (OH) 2 × 2 moles of HCl / 1 moles of Ca (OH) 2
= 0.008 moles of HCl
The volume of HCl which is required to reach the equivalence point can be calculated in the way given as follows.
Volume of HCl required= 0.008 moles of HCl × 1 L / 0.24 moles of HCl × 1 ml / 10 -³ L
= 33.33 ml
The additional volume of HCl calculated as
Additional volume = required volume – actual volume
= 33.33 mL – 25 mL
= 8 . 33 mL
Thus, we calculated that the additional volume of HCl which must be added to reach to the equivalence point is 8.33 mL.
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Answer:
The vapor pressure = 345.8 torr
Explanation:
Step 1: Data given
Number of molesof a non-volatile solute = 0.500 moles
mass of hexane = 275 grams
Molar mass of hexane = 86.18 g/mol
Temperature =49.6 °C
P°(hexane) = 400.0 torr at 49.6°C.
Step 2: Calculate moles solvent
moles of solvent = 275 grams / 86.18 g/mol = 3.19 mol
Mol fraction of the solvent = 3.19 moles / (0.500 + 3.19) = 0.8645
Step 3: Calculate the vapor pressure
P = P° * Xsolvent
⇒ with Xsolvent = mol fraction of the solvent = 0.8645
⇒ with P° hexane =400.0 torr
P = 400.0 * 0.8645 = 345.8 torr
The vapor pressure = 345.8 torr
