Question

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1) of the reactions below, which one is a decomposition reaction? A) Ca(NO3)2 + Na2S -- CdS +2NaNO3 B) NH4Cl- NH3 + HCI C) 2Mg + 02 - 2MgO D) 2N2 + 3H2 → 2NH3 E) 2CH4 + 402 - 2002 + 4H20 miches of - x 1? 2 2) Calculate the percentage by mass of ammonia in cisplatin, PtCl2/NH3 12. A) 12.53 B) 5.68 C) 18.09 D) 11.35 E) 4.67 3) Calculate the percentage by mass of hydrogen in PiCl2(NH3)2 A) 0.672 B) 2.016 C) 1.008 D) 0.034 E) 1.558 4) How many molecules of CH4 are in 48.2 g of this compound? A) 1.81 x 1024 B) 4.00 C) 2.00 1023 D) 4.64 x 1026 E) 5.00 x 10-24 5) A sample of CH2F2 with a mass of 19 g contains A) 9.5 B) 3.3 x 1024 C) 2.2 x 1023 atoms of F. D) 4.4 x 1023 E) 38 6) How many atoms of nitrogen are in 10 g of NH4NO3? A) 2 B) 3.0 x 1023 C) 1.8 D) 3.5 E) 1.5 x 1023 7) Gaseous neon has a density of 0.900 g/L at standard conditions. How many neon atoms are in 1.00 L of neon gas at standard conditions? A) 1.35 x 1025 B) 5.42 x 1023 C) 6.02 1023 D) 7.41 10-26 E) 2.69 x 1022 8) How many oxygen atoms are contained in 2.74 g of Al2(SO4)3? A) 6.02 x 1023 B) 12 C) 722 X 1024 D) 5.79 x 1022 E) 8.01 x 10-3

Answer 1

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