Question

What is the mass in grams of 23.4 moles of NaCl?

Answer 1

Explanation:

0.342 mol. Explanation: Molar mass of NaCl = 58.4 g/mol. Number of moles in 20.0 g NaCl is. 20.0g 58.4g /mol=0.342 ...

Answer 2

Answer:

The NaCl is formed when 1 electron at the outermost shell of Na is lost to provide a stable configuration (Na+ ion) and this extra electron is taken up by the Cl atom to form Cl- ion (also to provide a stable configuration). Thus, NaCl is formed.

Now, the number of moles is defined as a given mass of the sample to the molecular weight of the sample.

So, the number of moles = Given the mass of the sample/ Molecular weight of the sample

According to the question,

The sample is NaCl.

• The molecular weight of Na and Cl are 23 and 35.5 g/mol respectively.

• The molecular weight of NaCl = (23 +35.5) = 58.5g/mol. The moles of the sample is 23.4 moles.

So according to the formula,

• 23.4 = The given mass of NaCl/ Molecular weight of NaCl

• The given mass of the sample = ( 23.4*58.5) = 1368.9 g

So the mass of the NaCl sample is 1368.9 g or 1.3689 kg.