Molality is defined as the number of moles of solute in 1 kg of solvent.
In this case the solvent is water, therefore we need to find the number of moles of KBr in 1 kg of water.
Number of moles of KBr - 2.10 g / 119 g/mol = 0.0176 mol
mass of water - 897 g
number of moles of KBr in 897 g - 0.0176 mol
Therefore number of KBr moles in 1000 g - 0.0176 mol / 897 g x 1000 g = 0.0196 mol/kg
therefore molality of KBr is 0.0196 mol/kg
I think the correct answer from the choices listed above is option B. Polymerization is the process of forming c<span>omplex molecules by the bond formation between monomers. There are two types of this process which are the addition and condensation polymerization.</span>
Answer:
d=2760,9m
Explanation:
<em>The gravitational force between two equal masses is defined as </em>
<em>F=G.m^2/d^2 where m is mass, G is the universal gravitation ( approximately= 6,67x10^-11N.m^2/kg^2) constant , F is the attractive (or repulsive) force and d is the distance between the masses. </em>
<em>Substitude the values of the quantities into the equation </em>
<em>d^2= G.m^2/F</em>
<em>d= 2760,9m</em>
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Answer: The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy. In English, the equation says: To produce two molecules of water (H2O), two molecules of diatomic hydrogen (H2) must be combined with one molecule of diatomic oxygen (O2). Energy will be released in the process.
Explanation: