February 28, 2014. Final Polyatomic Ion Quiz Due: HW 7B Percentage Composition Lab Report due Wednesday March 5 Today’s video: Oldest known piece of earth How old?! What do you think their “technique” is? Z irconium silicate - ZrSiO 4. Percent Composition.
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n(Molar mass of element) x 100
Molar mass of compound
n = how many of that atom in the compound
Check by adding the %s: 27.29 + 72.71 = 100.00%
Check by adding the %s: 27.05 + 16.48 + 56.74 = 100.00%
Check by adding the %s: 74.50 + 25.50 = 100.00%
Check by adding the %s: 47.14 + 23.31 + 31.55 = 100.00%
= 43.85 % H2O