How many moles of Na2SO4 are present in 284.078 grams of Na2SO4? (5 points)
2
3
5
6

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?