What is the total charge of all protons in 3 gram of water (?_2?)? Your Answer:

Question

What is the total charge of all protons in 3 gram of water (?_2?)? Your Answer: 3 charges, 5 mu C each, are located on three vertices A, B, C of an equilateral triangle with sides 1 cm each. Another charge q is located at the mid point D of the side BC. Calculate q in micro Coulomb so that net force on the charge at A due to the charges at B, C and D is zero. In a right angle triangle ABC, angle ABC is 90 Degree, AB = 2 m, and angle ACB is 41.81 Degree. A point charge of 5*8 nC is placed at point C, point charge 4* 8 nC is placed at point A and point charge 1 C is placed in point B. Calculate the force on charge at B due to others two. Your Answer:

Explanation / Answer

16

molecular mass of H2O= 18 g

number of moles = n = given mass / molecular mass = 3 / 18 = 1/6

N = number of molecules = n (6.03 x 1023) = (6.03 x 1023) /6

number of electrons in 1 molecule = 10

Total number of electrons = 10 N = 10 (6.03 x 1023) /6 = 1.01 x 1024

Total charge = Q = (1.01 x 1024) (1.6 x 10-19) = 1.62 x 105 C

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