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Chemistry, 28.10.2019 17:29 saintjohn

1.when 69.0 of lead was heated in excess oxygen , 79.6g of an oxide of lead was obtained. what is the empirical formula of the oxide?

2.how many nitrogen atoms are present in 28l of nitrogen gas ar stp?

3.x^+ and y^2- ions and the isotope 40/18 z have the same # of electrons. what reference to the periodic table, identify x^+ and y^2-.

4.the number of particles in 0.02 mole of water molecules

5. the # of moles in 3.01 x 10^22 copper atoms

6. the mass of 0.75 mole of urea ,co(nh2)2

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