1. Suppose you were given one gold Adam every second since the big bang occurred

Question

1. Suppose you were given one gold Adam every second since the big bang occurred about 14 billion (1.4x10^10) years ago how many moles of gold atoms would you have? A. 7.3x10^-7 B. 4.4x10-17 C. 4.4x10^17 D. 2.3x10^-7 E. 1.4x10^-8
2. TNT (c7H5N3O6, 227.13 g/mol) and RDX (C3H6N6O6, 222.12 g/mol) are explosive materials. Which of the following contains the most nitrogen?
A. 145 g TNT B. 95.4 g RDX C. 0.875 mol RDX D. 3.45x10^23 molecules RDX E. 4.25x10^23 molecules TNT 1. Suppose you were given one gold Adam every second since the big bang occurred about 14 billion (1.4x10^10) years ago how many moles of gold atoms would you have? A. 7.3x10^-7 B. 4.4x10-17 C. 4.4x10^17 D. 2.3x10^-7 E. 1.4x10^-8
2. TNT (c7H5N3O6, 227.13 g/mol) and RDX (C3H6N6O6, 222.12 g/mol) are explosive materials. Which of the following contains the most nitrogen?
A. 145 g TNT B. 95.4 g RDX C. 0.875 mol RDX D. 3.45x10^23 molecules RDX E. 4.25x10^23 molecules TNT A. 7.3x10^-7 B. 4.4x10-17 C. 4.4x10^17 D. 2.3x10^-7 E. 1.4x10^-8
2. TNT (c7H5N3O6, 227.13 g/mol) and RDX (C3H6N6O6, 222.12 g/mol) are explosive materials. Which of the following contains the most nitrogen?
A. 145 g TNT B. 95.4 g RDX C. 0.875 mol RDX D. 3.45x10^23 molecules RDX E. 4.25x10^23 molecules TNT

Explanation / Answer

1.

14 billion years = 1.4*10^10 years

1.4*10^10 years = 1.4*10^10*365*24*60*60 = 4.415*10^17 sec

so that, no of gold atoms given = 4.415*10^17 atoms

no of mol of gold atoms given = (4.415*10^17)/(6.023*10^23) = 7.33*10^-7 mol

answer: A

2. answer: D

no of mol of RDX = (3.45*10^23)/(6.023*10^23) = 0.573 mol

1 mol RDX = 6 mol N

no of mol of N = 6*0.573 = 3.44 mol

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