What is the volume (in ml) of a 12.9 g piece of metal with a density of 7.25 g/cm3?

1.78 mL

Explanation:

The formula for density is mass divided by volume: D = m/V

Rearranging for volume, the formula becomes:

V = m/D = (12.9 g)/(7.25g/cm³) = 1.78 cm³ = 1.78 mL

(The conversion ratio between cm³ and mL is 1:1)

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.