Please help me out...

a. how many atoms are in 1.008 grams of hydrogen?

b. how many atoms are in 12.011 grams of carbon?

c. how many atoms are in 22. 989 grams of sodium?

d. how many atoms are in 63.55 grams of copper?

e. what is the mass of 1 mole of Br atoms?

f. what is the mass of 1 mole of Ag atoms?

g. what is the mass of 1 mole of Ca atoms?

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.