Which has more number of atoms ,100 grams of iron(given, atomic mass of Na=23u, Fe=56u)

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density

William has eight more nickels than dimes in his pocket for a total of $2.50. which equation could be used to determine the number of x dimes in his pocket?

How many moles of naoh are needed to make a 1 m solution?