How many grams of Ca are there in a sample of Ca that contains the same number of moles as a 77.4 gram sample of Zn?

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?

How does the motion of particles in a gas change as the gas cools

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.