What is the theoretical yield of H 2 O that can be obtained from the reaction of

Question

What is the theoretical yield of H2O that can be obtained from the reaction of 4.5 g H2 and excess O2?
           2H2(g) + O2(g) --> 2H2O(g)

A - 9.0 g
B - 81 g
C - 40 g
D - 4.5 g
E - 80 g

Using the arithmetic problem below, determine the correct number of significant figures.

(1.5 x 10 -4 x 61.3) + 2.01 =

A - 2.0
B - 2.019
C - 2.0192
D - 2.019195
E - 2.02

Rutherford's experiment with alpha particle scattering by gold foil established that:

A) protons are not evenly distributed throughout an atom
B) protons are 1840 times heavier than electrons
C) electrons have a positive charge
D) electrons have a negative charge
E) atoms are made of protons, neutrons, and electrons

Explanation / Answer

grams of water =( 4.5/2.02 ) * 18.02 = 40.143

so C

ans is A)2 [1.5 having the least no of significant figures there decides the no of significant figures)

the answer is none of these because

Rutherford's experiment with alpha particle scattering by gold foil established that protons are located in the nucleus of an atom

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