A sample of crushed rock is found to have 4.81 x1021 atoms of gold, how many moles of gold are present in this sample? 7.99 x 10^-3 moles

1.57 x10^-1 moles

1.25 x 10^3 moles

2.47 x10^5 moles

What are the similarities of physical and chemical change ?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

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.