Which conversion factor should be used to solve the following problem? How many moles of water (H2O) would be produced from the reaction of 3.25 moles of hydrochloric acid (HCl) reacting with excess calcium hydroxide Ca(OH)2?

Ca(OH)2 +2HCl --> CaCl2 + 2H2O

3.25 mol HCL x ?
Question 2 options:

2 mol HCl / 2 mol H2O

2 mol H2O / 2 mol HCl

2 mol HCl / 1 mol CaCl2

1 mol CaCl2 / 2 mol HCl

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Can someone me with 1 to 4 plz. fast

Match the name of the following compound:   mgso4  · h2omagnesium sulfate monohydratemagnesium (ii) sulfate monohydratemagnesium (ii) sulfate hydratemagnesium sulfate hydrate