How many grams of SiO2 are in 5.52 X 10^30 molecules

How many ions that have a +1 charge will bond with an ion that has a -2 charge

In 2002, the rare earth elements mine in mountain pass, california was closed because

Five different substances are given to you to be dissolved in water. which substances are most likely to undergo dissolution in water? check all that apply. view available hint(s) check all that apply. sodium fluoride, naf octane, c8h18 propanol, ch3ch2ch2oh potassium iodide, ki benzene, c6h6