Convert 1.29×1024 atoms of carbon to moles of carbon.

If 3.00 g of titanium metal is reacted with 6.00 g of chlorine gas, cl2, to form 7.7 g of titanium (iv) chloride in a combination reaction, what is the percent yield of the product?

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The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.