Amole is equal to 6.02 x 10²³, just like a dozen is equal to 12. so if you have a mole of carbon atoms, you have 6.02 x 10²³ carbon atoms. likewise, if you have a dozen carbon atoms, you have 12 carbon atoms. the atomic mass on the periodic table is also known as the molar mass. the molar mass is the mass of 1 mole of the element. therefore, 1 mole of carbon has a mass 12.01g/mole. how many atoms are in 5.2 grams of carbon? show your work. (this is a unit conversion problem.)

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

Which of the following is not true about the atomic model of substances?

Isopropyl alcohol, (ch3)2choh, is a common solvent. determine the percent by mass of hydrogen in isopropyl alcohol. a) 6.71% h b) 13.4% h c) 25.0% h d) 53.3% h