a compound with a molar mass of about 42g/mol contains 85.7% carbon and 14.3% hydrogen by mass. Write the Lewis structure for a molecule of the compound​

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?