An unknown acid has a hydronium ion concentration of 0.00352. what is its ph
-0.00352
0.00352
2.453
12.65

If two objects at different te,peraure are in contact with each other what happens to their temperature

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?