[Vontox7]

Can you give a good source for chemistry practice?
For example we are learning about moles and conversion in general it is using chemical formulas. the book's questions are like what is the molar mass of barium nitrate while the test questions are like for a sample of (NH4)2Fe(CN)6 find the mass of nitrogen in 187 of the sample, the mass of carbon in 6.71x10^22 molecules in the compound. Can you give me a way to study and be prepared for the test and a source for questions or anything that will help me??

Thank you very much for your *delete me*

[Borek]

Try

http://www.chemistry-quizzes.info/

Especially

http://www.chemistry-quizzes.info/quizz.php?m=n&s=mass-moles-atoms

http://www.chemistry-quizzes.info/quizz.php?m=n&s=percent-composition