How many atoms of aluminum (Al) are in 6.4 mol of aluminum

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Acompound contains c, h, and o atoms. when 1.130 g of the compound is burned in oxygen, 1.064 g co2 and 0.3631 g h2o are produced. what is the empirical formula of this compound?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins