Question

Density of an aqueous calcium chloride solution is 1.23 g per mL. If 30.0 grams of the solution are needed for a reaction, how many mL of the CaCl2 solution should be poured into the reaction vessel? (This question is about calculating the volume if given the mass and density).

36.9 ml
		0.0369 ml
		0.0004 ml
		24.4 ml

How many moles of magnesium, Mg, are there in 202 g of magnesium oxide, MgO? Report your answer to 3 significant figures!

5.01 moles

5 moles

3.02X10^24 moles

5.0124 moles

Density of an aqueous calcium chloride solution is 1.23 g per mL. If 123 grams of the solution are needed for a reaction, how many mL of the CaCl2 solution should be poured into the reaction vessel? (This question is about calculating the volume if given the mass and density).

151 mL

0.0151 mL

100. mL

0.0041 ML

		36.9 ml
		0.0369 ml
		0.0004 ml
		24.4 ml

		5 moles
		3.02 X 1024 moles
		5.0124 moles Are any spectator ions in the following chemical equation? Ag+(aq) + Na+(aq) + Cl-(aq) -- > AgCl(s) + Na+(aq)

Answer 1

Density of an aqueous calcium chloride solution is 1.23 g per mL. If 30.0 grams of the solution are needed for a reaction, how many mL of the CaCl2 solution should be poured into the reaction vessel? (This question is about calculating the volume if given the mass and density).

D = 1.23 g/ml

m = 30 g of solution

find volume of solution needed

the equation

D = mass/Vol

solv efor Vol

Vol = mass/D = 30/1.23 = 24.39024 ml

Volume requried = 24.39024

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