What is the total number of hydrogen atoms present in 6 formula units of Mg(C_2H

Question

What is the total number of hydrogen atoms present in 6 formula units of Mg(C_2H_3O_2)_2? A) 36 B) 18 C) 6 D) 12 E) 24 What is the mass number of a chromium isotope containing 28 neutrons? A) 76 B) 80 C) 28 D) 24 E) 52 All atoms of a given element may have different numbers of A) gamma rays B) protons C) neutrons D) electrons E) nucleons In the formula C_4H_8O_2 A) the ratio of carbon to hydrogen to oxygen atoms is 2:4:1 B) the percentage by mass of hydrogen is the same as oxygen C) there are two elements with the same percentage by mass. D) there is a total of 10 atoms E) there are 2 different elements The maximum number of electrons found in a shell A) varies in an unpredictable manner B) is equal to 2n^2 C) doubles as the shell number increases by one D) is the same as the shell number E) is equal to n^Z Which of the following elements has an electron configuration ending in 4f^3? A) 60^Nd B) 41^Nb C) 40^Zr D) 73^Ta E) 72^Hf Which element/classification pair is inc

Explanation / Answer

15) Mg(C2H3O2)2

1 formulqa unit contain 6 H atoms

so 6 formula units contain 6 x 6 = 36 H atoms

answer = option A = 36

16) mass number = number of protons + number of neutrons = 24 +28 = 52

answer = E = 52

17) option C = neutrons

18) answer = option A = the ratio of C to H to O is 2 :4: 1

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