Gen Chem I LG #3 Fall 2020

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New York University *

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125

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Chemistry

Date

Jan 9, 2024

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pdf

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4

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General Chemistry I LG Leader: Tom Zhang Email: tz1101@nyu.edu Week of Sept. 28, 2020 1. Balance the following equations: a. _____ Al 2 O 3 + _____ Fe → _____ Fe 3 O 4 + _____ Al b. _____ CH 4 + _____ O 2 → _____ C 2 H 2 + _____ CO + _____ H 2 c. _____ NH 3 + _____ Br 2 → _____ NH 4 Br + _____ N 2 d. _____NaBr + _____NaBrO 3 + _____H 2 SO 4 → _____Br 2 + _____Na 2 SO 4 + _____H 2 O e. _____NO + _____KI + _____HCl → _____NH 4 Cl + _____KCl + _____I 2 + _____H 2 O f. _____ NH 3 + _____ O 2 → _____ NO + _____ H 2 O g. _____ Cl 2 + _____ H 2 O → _____ HClO 4 + _____ H 2 h. _____ Cl 2 O + _____ NH 3 → _____ NH 4 Cl + _____ N 2 + _____ H 2 O i. _____FeCr 2 O 4 + _____Na 2 CO 3 + _____O 2 →_____Na 2 CrO 4 + _____Fe 2 O 3 + _____CO 2 j. _____ SCl 2 + _____ NH 3 → _____ S 4 N 4 + _____ NH 4 Cl + _____ S
General Chemistry I LG Leader: Tom Zhang Email: tz1101@nyu.edu Week of Sept. 28, 2020 2. An element X has a bromide whose empirical formula is XBr 2 and a chloride whose empirical formula is XCl 2 . The bromide is completely converted to the chloride when it is heated in a stream of chlorine according to 𝑋?𝑟 2 + ?𝑙 2 →𝑋?𝑙 2 + ?𝑟 2 When 1.500 g of XBr 2 is treated, 0.8897 g of XCl 2 results. Identify the element X. 3. Potassium superoxide (KO 2 ) absorbs carbon dioxide from the air according to the (unbalanced) equation 𝐾𝑂 2 + ?𝑂 2 → 𝐾 2 ?𝑂 3 + 𝑂 2 In one experiment, 10.00 g of KO 2 and 5.00 g of CO 2 are combined and yield 2.00 g of oxygen gas. a) Determine the percent yield. b) Assuming that the low yield was due to an incomplete reaction, how many grams of each reactant are left unreacted at the end of the reaction?
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