Queremos preparar 250 cm3 de disolución de sal en agua, con una concentración de 5 g/l. ¿Qué cantidad de sal debemos disolver en agua?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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.

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need