For the titration of 45.0 ml of 0.350 m nh3 with 0.500 m hcl at 25 °c, determine the relative ph at each of these points.
(a) before the addition of any hcl
(b) after 18.0 ml of hcl has been added
(c) after 33.0 ml of hcl has been added

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Which of the following units is not an official si unit

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma