A compound contains only the elements and . A sample of the compound with a mass of 12.5 g is found to contain 6.50 g of . What is the percentage composition of the compound?
A 10 g sample of silicon carbide is found to contain 3.0 g of carbon. What is the percentage composition of silicon carbide?
What is the percentage composition of calcium carbonate ? State percentages to 1 decimal place.
To 1 decimal place, calculate the oxygen content of a water molecule as a percentage of the total mass.
A 5.0 g sample of spinal fluid contains 3.75 mg (0.00375 g) of glucose. What is the percent by mass of glucose in spinal fluid?
A bottle of a tile cleanser contains 135 g of and 775 g of water. What is the percent by mass of in this cleanser?