What wau of sodium contain the same mass as 5.oog 71g (3) (6) 8.713 g (1) 2. 68g

Question

What wau of sodium contain the same mass as 5.oog 71g (3) (6) 8.713 g (1) 2. 68g The total number of moles of atoms in es og or "mts is (3) 16 (5) 8.00 (7) 4.00 (81 4 2) a 02 N 10 (4) 16 ai ven the reaction N2 3H, 2NI, How many moles of nitrogen are needed to produce s moles of ammonia? (3) (4) (2) The percentage by mass of nitrogen in NH, is (1) (4) 82 (2) 17 If 20. milliliters of a 1. o M solution of HC1 is t exactly neutralized by 40 of NaoH molarity of the NaOH solution is (3) 0.50 (4) 4 A compound with a molar mass of 34 g contains hydr and oxygen in a mole ratio of 1: 1. The molecular formula of the compound is (3) OH (1) Ho (4) HoH (2) would co How many liters of a o.2 M Na OH solution 0.4 mole of NaoH (3) (4) The percentage composition of a compound is 26 molar 38.1.03 molecular formula. K. 300. Calculate the (5) Kacro. (1) KCro (4) K2crzo, (2) Kcro.

Explanation / Answer

68 g NH3 number of moles

number of moles = given mass/atomic mass

number of moles = 68.0/17 = 4 moles

total atoms = 4 = 4 * 4 = 16.0 moles

part 2 )

mass % of N = 14/17 * 100 = 82%

part 3 )

for nuetralization

M1v1 = M2v2

1*20 = 40 *M

M = 0.5 M

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