How many atoms are in 95 grams of copper

Here's a quick conversion before I answer your question, use it whenever needed.

1 moles Copper to grams = 63.546 grams. 2 moles Copper to grams = 127.092 grams. 3 moles Copper to grams = 190.638 grams. 4 moles Copper to grams = 254.184 grams. 5 moles Copper to grams = 317.73 grams. 6 moles Copper to grams = 381.276 grams. 7 moles Copper to grams = 444.822 grams.

Ok, now I'll answer your question.

Atomic masses are given in atomic mass units. One atomic mass unit is equal to one gram per mole. When you add these together for a compound, you get the molar mass of that compound. For example, silicon dioxide consists of one silicon atom and two oxygen atoms. The atomic mass of silicon is 28 grams and the atomic mass of oxygen is 16 grams.

(Hope the conversion and the answer helped) Sky

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

it's all four options.