166k views
5 votes
The molar mass of copper chloride is 134.45g/mol. How many formula units of copper chloride are present in 17.6g of copper chloride

User SatAj
by
5.1k points

1 Answer

5 votes

Answer:

7.88 x 10²² formula units CuCl₂

Step-by-step explanation:

To find the amount of formula units, you need to (1) convert grams to moles (via the molar mass) and then (2) convert moles to formula units (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Molar Mass (CuCl₂): 134.45 g/mol

Avogadro's Number:

6.022 x 10²³ formula units = 1 mole

17.6 g CuCl₂ 1 mole 6.022 x 10²³ formula units
-------------------- x ----------------- x ------------------------------------------ =
134.45 g 1 mole

= 7.88 x 10²² formula units CuCl₂

User Jnoreiga
by
5.9k points