E 17

[Snigdha Uppu 1G]

Which sample in each of the following pairs contains the
greater number of moles of atoms? (a) 75 g of indium or 80 g of
tellurium; (b) 15.0 g of P or 15.0 g of S; (c) 7.36 3 10 27 atoms of
Ru or 7.36 3 10 27 atoms of Fe.

[Tanmay Singhal 1H]

A) 75 g of indium
B) 15 g of P
C) same number of moles

[Snigdha Uppu 1G]

Thank you for answering my question

[connie 2C]

for part a and b, you would use the molar mass of the element to calculate the number of moles in each sample of the element. for part c, you would use avogadro's number to calculate the amount of moles in amount given.

[Cynthia Rodas 4H]

Parts (a) and (b) use the equation m= n * M.
m- mass of the sample
n- amount in moles
M- molar mass

Part (c) uses the equation n = N/N_A
n- amount in moles
N- number of objects
N_A- Avogadro's constant