Agraduated cylinder has a mass of 50 g when empty. when 30 ml of water is added, the graduated
cylinder has a mass of 120 g. if a rock is added to the graduated cylinder, the water level rises to 75
ml and the total mass is now 250 g. what is the density of the rock?

The answer to your question is: 10.67 g/ml

Explanation:

graduated cylinder mass empty= 50 g

+ 30 ml of water = 120 g

+ a rock the level rises 75 ml total mass = 250 gr

density of metal = ?

Formula

density = mass / volume

Process

mass of water = 120 - 50 = 70 g

volume of rock = 75 ml

mass of the rock = 250 - 50 - 120 = 80 g

density of rock = 80 / 75 = 10.67 g/ml

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.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error