Question #0f255

1 Answer
Catherine T. Mohs
Sep 30, 2017

1.02*10^26 1.02*10^261.02⋅1026 atoms of Ca

Explanation:

(6.78*10^3 "grams of Ca")/1*((1 "mole of Ca")/(40.078 "g of Ca"))*((6.0221*10^23 "atoms of Ca")/(1 "mole of Ca"))=101875936923000149708069264.93338 "atoms of Ca"6.78⋅103grams of Ca1⋅(1mole of Ca40.078g of Ca)⋅(6.0221⋅1023atoms of Ca1mole of Ca)=101875936923000149708069264.93338atoms of Ca
Three significant digits. so the answer is...
102000000000000000000000000 atoms of Ca

And in correct scientific notation...
1.02*10^261.02⋅1026 atoms of Ca

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