Which tool should be used to measure the mass of an object?

What is the molality of a solution that has 4 mol of kci in 0.800 kg of water

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!