Open Question
Calculate the percentage by mass of lead in Pb(NO3)2.
3. Chemical Reactions
Mass Percent
Back3. Chemical Reactions
Mass Percent
- Multiple Choice
Determine the percent composition of nitrogen and oxygen with nitrogen dioxide, NO2.
- Multiple ChoiceA 70.0-g iron nail combines with 30.0 g of oxygen to form rust. What is the total mass of the iron nail plus the rust that forms?
- Multiple ChoiceA nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be:
- Multiple ChoiceThe following data were collected when analyzing a compound used in dentistry as a cement to repair teeth:
50.82% Zn;16.04% P;33.14% O
What is the empirical formula of the compound? - Multiple ChoiceBased on the amounts of reactants used the calculated amount of product that can form for a given reaction was 20.76 g. When the reaction was carried out in a laboratory 17.34 g of product was recovered. What is the percent yield for this reaction?
- Open Question
A compound whose empirical formula is XF3 consists of 65% F by mass. What is the atomic mass of X?
- Open Question
What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures?
- Open Question
Calculate the mass percent composition of lithium in Li3PO4.
- Open Question
What is the percentage of nitrogen, by mass, in calcium nitrate?
- Open Question
What is the percent composition for carbon and hydrogen in ethane C2H6?
- Open Question
We dissolve 2.45 g of sugar in 200.0 g water. what is the mass percent of sugar in the solution?
- Open Question
A 500 gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore?
- Open Question
What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?
- Open Question
A 69.5 g sample of the compound X3O4 contains 19.2 g of oxygen atoms. What is the molar mass of element X?