Tính nhiệt cháy của CH3OH , nếu biết: ∆Ho298,ch, C= -94,05 Kcal/mol; ∆Ho298,s, CH3OH=-173,65 Kcal/mol; ∆Ho298,ch, H2= -68,32 Kcal/m

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

What metric units would you use to measure the thickness of a key