2. How many moles of copper, Cu, are needed to react with sulfur, S, to produce 0.25 moles of copper(I) sulfide,
Cu S, according to the following reaction?
2 Cu + S Cus
Known:
Unknown:
How many moles of sodium, Na, are needed to react with sulfuric acid, H, SO,, to produce 3.75 moles of sodium

its weight is greatest on earth

its first and third is your answer i did the qustion the fourth isnt right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer