How many moles of solute are contained in the following solutions?

246.86 mL of 2.21 M CaCl2

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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