How many moles is 2.80•10 (to the power of 24) atoms of silicon?

Alculate the concentration of h3o⁺in a solution that contains 5.5 × 10-5m oh⁻at 25°c. identify the solution as acidic, basic, or neutral.a) 1.8 × 10-10m, basicb) 1.8 × 10-10m, acidicc) 5.5 × 10-10m, neutrald) 9.2 × 10-1m, acidice) 9.2 × 10-1m, basic

Ab c or d ? i’m not sure what the answer is

Which of the following molecules is polar? c3h7oh c2h5cooh