<span>Molality(m) or molal concentration is a measure
of concentration and it refers to amount of substance in a specified amount of
mass of the solvent. Used unit for molality is mol/kg which is also
sometimes denoted as 1 molal. It is equal to the moles of solute (the substance
being dissolved) divided by the kilograms of solvent (the substance used to
dissolve).</span>
Molarity(M) or molar concentration is also a
measure of concentration and represents the amount of substance per unit volume
of solution(number of moles per litre of solution. Used unit for molarity is
mol/L or M. A solution with a concentration of 1 mol/L is equivalent to 1 molar
(1 M).
Molality is preferred when
the temperature of the solution varies, because it does not depend on
temperature, (neither number of moles of solute nor mass of solvent will be affected
by changes of temperature), while molarity changes as temperature changes(volume
of solution changes as temperature changes).
When we measure<span> an object's </span>temperature<span>, we </span>measure<span> the average kinetic energy of the particles in the object. The higher the </span>temperature<span>, the faster the molecules of the substance move, on the average.
</span>
B Because the composition of the solution is uniform throughout, it is a homogeneous mixture. AOrange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. B Because its composition is not uniform throughout, orange juice is a heterogeneousmixture.
Answer:
B.
Explanation:
an excess is normally used to ensure that all the reactants completely react in the reaction to form the expected amount of yield.
The subatomic particle that contributes to an atom's mass number but not to its atomic number would be the neutron.
