11 Questions
What is the percentage of carbon in ethane (C2H6)?
80.0%
What is the percentage of oxygen in CaCO3?
48.0%
What is the empirical formula for a chemical compound with 0.556 g C and 0.0933 g H?
CH3
A compound contains 0.90 g Ca and 1.60 g Cl, what is its empirical formula?
CaCl2
What is the empirical formula of a compound containing 68.12 g C, 13.73 g H, and 18.15 g O?
C5H12O
What is the molarity of a solution prepared by dissolving 9.8 moles of solid NaOH in enough water to make 3.62 L of solution?
2.7 mol/L
What is the molarity of a solution made by dissolving 152.5 g CuCl2 in water to make a final volume of 2.25 L?
0.5041 mol/L
What would part per trillion (ppt) equal to?
1 µg of solute per kg of solution
What is the mass percentage of solute in a solution containing 13.5 g of glucose in 100 g of water?
11.9%
What is the mass percentage of NaCl in a solution containing 1.50 g of NaCl in 50.0 g of water?
2.91%
What is the concentration of Zn2+ in ppm if a 2.5-g sample of groundwater was found to contain 5.4 µg of Zn2+?
2160 ppm
Test your understanding of percent composition in solutions with this quiz. Explore how to calculate the percentage of each element's mass in a compound and apply the equation % element = (number of atoms)(atomic weight) / (molecular weight of the compound) x 100.
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