Calculate the standard reaction entropy for the formation of 1 mol H2O(ℓ) from the elements in their most stable state at 298 K if S◦
H2O(ℓ) 69.91 J/ K·mol
H2(g) 130.68 J/ K·mol
O2(g) 205.14 J/ K·mol
Answer in units of J/ K · mol.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

b) nuclear ive learned that in a pedtrodic table

plasma - state of matter made up of electrically charged particles

5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3