A 5.3644 g sample of an unknown hydrate of cobalt(II) bromide is heated until all the water of hydration is removed. The CoBr2 that remains has a mass of 3.8000 g. 1. How many moles of CoBr2 are in the sample? 2. How many grams of water were lost in the dehydration? mol g مه 3. How many moles of water were lost? (mol) • 4. What is the value of "n" in the formula CoBr2 n H₂O? (1, 2, 3, 4...).

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Automotive airbags a inflate when sodium azide decomposers exclusively to its constituent elements 2NaN3(s)---->2Na(s)+3N2(g) how many moles of N2 are produced by the decomposition of 1.88 more of sodium azide

The reaction of H2 and O2 produces water 2H2 + O2 -> 2H2O If there are 5 moles of O2 how many moles of H2 are needed for the reaction? How many moles of H2O form when 2.5 moles of O2 react?

How many grams of N2 are needed to completely (stoichiometrically) react with 222 g of Br2 ? N2 + 3 Br2 2 NB13 + 44.0 kJ The molar mass of Br2 is g and the molar mass of N2 is mol Br2 (2.22 x 102 g Br2)(- mol Br2 g Br2 mol N2 mol Br2 (-- -) = mol N2 mol Br2 g N2 mol N2 (-- -) = |v g N2 mol N2 а. 1 b. 2 С. 3 d. 4 е. 5 f. 253.719 g. 3.38 х 100 h. 3.26 x 103 i. 44.0 j. 1.33 x 102 k. 9.77 x 103 I. 4.44 x 102 m. 6.66 x 10² n. 500.0 o. 556 р. 90.0 q. 3.2852 r. 159.81 s. 28.013 t. 1.750 u. 0.8750 v. 13.0 w. 0.46306 х. 1.3892 у. 24.5 z. 38.5 аа. 2.190 bb. evolved Cc. absorbed dd. exothermic ee. endothermic

Bismuth oxide reacts with carbon to form bismuth metal:  Bi2O3(s) + 3C(s)→2Bi(s) + 3CO(g)  When 353 g ofBi2O3reacts with excess carbon, 1. how many moles of Bi form? 2. how many grams of CO form?

O STARTING AMOUNT esc X # According to the balanced reaction below, calculate the moles of NH3 that form when mol of N₂H4 completely reacts ADD FACTOR X () 32.06 3.2 mol NH3 $ 4.2 1 % 3 g N₂H4 Question 24 OT 38 of N₂H4(1)→ - 6.022 x 1023 4.2 mol N₂ 3 4 NH3(g) + N₂(g) 6 5.6 ANSWER g N₂ 28.02 O 7 16.8 17.04 mol N₂H4 RESET 2 g NH3 4 Feb 23

Consider the reaction of zinc metal with hydrochloric acid: Zn + 2 HCI - ZnCl, + H, Calculate the moles of HCl needed to react completely with 8.25 moles of zinc. O a 16.5 moles of HCI More information is needed. 4.13 moles of HCI O d 8.25 moles of HCI

For the chemical reaction 2 NaOH + H₂SO4 Na₂SO4 + 2 H₂O how many moles of sodium sulfate will be produced from 28.1 g of sodium hydroxide? moles of sodium sulfate: mol