What lab equipment is best to use when measuring 19.5mL

Volumetric cylinders and volumetric carafes are utilized to gauge volume of fluids contained in them.

Explanation:

Volumetric cylinders and volumetric carafes are utilized to gauge volume of fluids contained in them. They are adjusted for volume remembered for them - this is shown by the checking "IN". The fluid has precise volume when it arrives at the comparing stamping on the scale. Volume is generally demonstrated in ml.  

There are numerous instruments that researchers use to gauge explicit volumes, including a graduated chamber, buret, or pipette.

8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right

explanation:

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.