Achemistry student needs of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is . calculate the mass of glycerol the student should weigh out.

The mass of glycerol that the student should weigh out depends on the volume that is needed. For example, the density of glycerol is 1.26 g/mL. Then, if 500 mL of glycerol is needed, 630 g should be weighed.

Explanation:

Density is the amount of mass per unit of volume. Density relates how many grams 1 milliliter of a substance weighs. Thus, if the density of glycerol is 1.26 g/mL means that 1.26 grams of glycerol occupy 1 mL of volume, or, in other words, 1 mL of glycerol weighs 1.26 grams.

Therefore, if 500 mL of glycerol is required to use for an experiment, 630 grams need to be weighed:

1 mL glycerol 1.26 g

500 mL glycerol x= 500mL * 1.26 g / 1 mL = 630 g

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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