Scelta multipla
Approximately how much does one mole of carbon atoms (each having an atomic weight of 12) weigh?
164
views
2. Atoms & Elements
Calculating Molar Mass
Scelta multipla
Which of the following compounds has a molar mass of 174.3 g/mol?
A
KClO_3
B
Ba(NO_3)_2
C
Na_2SO_4
D
CaCO_3
Guida verificata passo dopo passo1
Identify the molecular formula of each compound given: KClO_3, Ba(NO_3)_2, Na_2SO_4, and CaCO_3.
Look up the atomic masses of each element involved (approximate values: K = 39.1, Cl = 35.5, O = 16.0, Ba = 137.3, N = 14.0, Na = 23.0, S = 32.1, Ca = 40.1, C = 12.0).
Calculate the molar mass of each compound by multiplying the atomic mass of each element by the number of atoms of that element in the formula, then summing all contributions. For example, for Ba(NO_3)_2, calculate: \(\text{Ba} + 2 \times (\text{N} + 3 \times \text{O})\).
Compare the calculated molar masses of all compounds to the target molar mass of 174.3 g/mol.
Identify which compound's molar mass matches 174.3 g/mol, confirming the correct answer.
Video correlati
Pratica correlata
