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?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull