Practice Grams (Mass) in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A gram (g) is the standard working unit of mass in chemistry, defined as one thousandth of a kilogram (the SI base unit of mass).
Grams tell you how heavy something is. A paperclip is about 1 gram. Moles tell you how many particles you have—a completely different question.
Showing a random 20 of 50 problems.
Example 1
mediumIn , how many grams of water form from ? (, )
Example 2
challengeA mixture contains He () and (). What is the total number of moles, and the mass percent of He?
Example 3
easyHow many grams are in of carbon ()?
Example 4
easyConvert to grams.
Example 5
mediumHow many grams of glucose (, ) are needed to prepare of a solution?
Example 6
mediumWhat is the mass percent of N in NHNO (, atomic N=14)?
Example 7
easyConvert to milligrams.
Example 8
mediumIn , how many grams of NH () form from of N ()?
Example 9
mediumHow many grams of react with in ? ()
Example 10
mediumHow many grams are in of ()?
Example 11
mediumHow many grams of CaCO () form from Ca in ?
Example 12
hardHow many grams of HO () form from burning CH () in ?
Example 13
easyConvert moles of sodium chloride (NaCl) to grams. (Molar mass of NaCl = )
Example 14
mediumFind the molar mass of ().
Example 15
mediumHow many moles are in of NaCl ()?
Example 16
mediumWhat mass of () contains the same number of moles as of ()?
Example 17
mediumHow many milligrams are in ?
Example 18
easyWhat is the molar mass of MgO ()?
Example 19
easyHow many grams are in of oxygen gas ()?
Example 20
mediumHow many moles are in g of sulfuric acid ()? How many molecules does this represent? (Molar mass = )