A solution that is 0.024 M in Na+ can be prepared by adding how many grams of Na2SO4 (MW 142 g) to water and diluting to a final
volume of 140.0 mL?
1. 0.00024 g
2. 0.24 g
3. 95 g
4. 0.48 g
5. 0.0095 g

Remember to use the proper number of significant figures and leading zeros in all calculations.gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver