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How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, $C_2H_4$ (g)?
How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, $C_2H_4$ (g)?
Which is a possible empirical formula for a substance with Mr = 42?
Which is a possible empirical formula for a substance with Mr = 42?
Which quantities are different between two species represented by the notation $({52}^{128})Te$ and $({53}^{128})I^-$?
Which quantities are different between two species represented by the notation $({52}^{128})Te$ and $({53}^{128})I^-$?
What is the relative atomic mass of a sample of chlorine containing 70 % of the $^{35}Cl$ isotope and 30 % of the $^{37}Cl$ isotope?
What is the relative atomic mass of a sample of chlorine containing 70 % of the $^{35}Cl$ isotope and 30 % of the $^{37}Cl$ isotope?
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Which molecule is polar?
Which molecule is polar?
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