Applying the principle that the elements of a particular column in the periodic table share the same chemical properties, complete the following chart. the first one has been done for you.
formulanew combinationpredicted formula
cu₂osilver + oxygenag₂o
naclpotassium + chlorine
alcl₃aluminum + fluorine
co₂tin + oxygen
mgcl₂calcium + bromine
hclcesium + iodine
ccl₄silicon + bromine

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

the answer to your question is c.

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