Draw the Lewis dot structure of each molecule below. Which substance has two lone pairs in its Lewis dot structure?

a
CO2

b
H2O

c
CH4

d
NH3

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

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?