The percent by mass of nitrogen in caffeine, C_8H_10N_4O_2, is: 16.48% 28.85% 57

Question

The percent by mass of nitrogen in caffeine, C_8H_10N_4O_2, is: 16.48% 28.85% 57.70% 14.43% none of a, b, c, or d Circle the correct structure for AB_4E, where B represents a bonded atom and E a lone pair of electrons. see-saw trigonal bipyramidal square pyramidal tetrahedral none of these In the nuclear decay process of beta emission, which of the following occurs? _1^1p rightarrow _0^1n + +1^0e _0^1n rightarrow _1^1p + -1^0e _1^1p + -1^0e rightarrow _0^1n none of b, or c A hydrogen atom orbital that has two radial nodes and two planar nodes could be a ... 4p_y orbital 4d_yz orbital 5p_y orbital 5d_yz orbital none of a, b, c, or d The concentration of K&+ (aq) in a 0.150 M solution of potassium sulfate is: 0.0750 M 0.150 M 0.300 M 0.450 M none of a, b, c, or d Which of the following transitions for a H atom would produce a photon with the longest wavelength? n = 5 to n = 3 n = 3 to n = 2 n = 5 to n = 4 n = 4 to n = 2 n = 2 to n = 1

Explanation / Answer

1. b (56 x 100/194) = 28.85

2. b (AB4E is bipyramidal in nature eg. SF4)

3.b (decay of neutron to proton in the nuclues causes beta emission)

4.d. Total number of nodes are n-1, total number of radial nodes are n-l-1, total number of planar nodes are (total -radial)

5.c (2x 0.150 = 0.300 M ie K2SO4

6.c

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