Which is the stronger acid- sulfuric or ethanoic? What is the evidence for this? Please answer quickly

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Define dew point. i am writing this part to be able to ask the question

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?