Impure substance, because pure would be dirt from the earth
Density of a substance is given by dividing its mass with volume.
The volume of the block is 3.5 cm× 2.0 cm ×1.5 cm = 10.5 cm³
thus density = 34.56 g/ 10.5 cm³
= 3.291 g/cm³
Maybe the dessert, because it's dry
⁴⁰Ar
N(e)=18
N(p)=18
N(n)=40-18=22
⁴⁰K
N(e)=19
N(p)=19
N9n)=40-19=21
⁴⁰Ca
N(e)=20
N(p)=20
N(n)=40-20=20
Answer:
0.2mol/kg
Explanation:
molality is the concentration of a solution in moles of solute per kilogram of solvent
moles of solute (NaOH) = 2moles
mass of solvent in kg. =10kg
Therefore molality. = 2moles/10 kg
=0.2mol/kg
