What is the mass of 1.477 times 10^22 molecules of NH_3? 0.00829g 0.417g 2.49g 1

Question

What is the mass of 1.477 times 10^22 molecules of NH_3? 0.00829g 0.417g 2.49g 121g 0.141g What is the stoichiometric coefficient for water (H_2O) when the following equation is balanced using the lowest, whole-number coefficients? _____ CH_4 (g) + ______ O_2 (g) rightarrow _______ CO_2 (g) + _______ H_2O (g) 1 2 3 4 5 What is the chemical formula for magnesium hydroxide? MgH_2 MnOH MgOH_2 Mg(OH)_2 Mn_2OH_2 How many grams of Li_3N can be formed from 5.228 moles of Li? Assume an excess of nitrogen. 6 Li (s) + N_2 (g) rightarrow 2 Li_3N(s) 18.3 g Li_3N 20.3 g Li_3N 58.3 g Li_3N 61.0 g Li_3N 15.1 g Li_3N Give the theoretical yield, in moles, of CO_2 from the reaction of 2.00 moles of C_8H_18 with 2.00 moles of O_2. 2 C_8H_18 + 25 O_2 rightarrow 16 CO_2 + 18 H_2O 0.640 moles 64.0 moles 2.56 moles 1.28 moles 32.0 moles

Explanation / Answer

86)
1st find the number of moles of molecules by dividing it by Avogadro's number

number of mol = 1.477*10^22 / (6.022*10^23)
= 0.02453 mol

mass of NH3 = number of mol * molar mass of NH3
= 0.02453 mol * 17 g/mol
= 0.417 g

Answer: B

87)
CH4 + 2O2 ---> CO2 + 2H2O
Answer: B

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