Tin metal reads completely with oxygen to produce an unknown oxide, Sn_x O_y. Wh

Question

Tin metal reads completely with oxygen to produce an unknown oxide, Sn_x O_y. Which measurements can be used to determine the empirical formula of Sn_xO_y? (A) partial pressure of O_2 before and after the reaction (B) starting mass of Sn and the mass of Sn_xO_y product (C) temperature of the mixture before and after the reaction (D) mass of O_2 before and after the reaction Aluminum has a density of 2.699 g cm'3 at 25 degree C. A student determines the density in three separate trials, obtaining the tabulated data. This student's results are (A) precise but not accurate. (B) accurate but not precise. (C) both accurate and precise. (D) neither precise nor accurate. Which is the best procedure to prepare one liter of a 1.0 M NaOH solution starting with 1.0 mol of NaOH? (A) Dissolve 40.g of solid NaOH in 1.0 L of water (B) Dissolve 40.g of solid NaOH in enough water to make 1.0 L of solution. (C) Dissolve 40. g of solid NaOH in 1000 g water. (D) Dissolve 40. g of solid NaOH in 960 g water

Explanation / Answer

Q68.

Sn(s) + O2(g) = SnxOy

the easiest way to calcualte this is via

starting mass of Sn --> Calculate moles of Sn present

therefore

calcualting mass of Oxygen present in SnxOy --> moles of O

relate Sn : O

then you get x, y

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