Question

A)
The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
(1 point)
1 mole Ne = 20.180 grams =
atoms
6.022
×
10
23
1 gram Ne = 20.180 moles =
atoms
6.022
×
10
23
1 gram Ne = 20.180 moles =
atoms
1.215
×
10
25
1 mole Ne = 20.180 grams =
atoms
1.215
×
10
25
A)
The atomic mass of carbon (C) is 12.011 amu, and the atomic mass of hydrogen (H) is 1.008 amu.Which substance has a molar mass of 42.081 g/mol?
(1 point)
C
H
3
6
C
H
3
8
C
H
2
6
C
H
2
4

Answer 1

First question: 1 mole Ne = 20.180 g = 6.022 × 10^23 atoms. (Correct: molar mass means 1 mol of Ne has mass 20.180 g and contains Avogadro's number of atoms.)

Second question: C3H6. Calculation: 3×12.011 + 6×1.008 = 36.033 + 6.048 = 42.081 g/mol.