Question

question 2 10 pts true or false? one mole of gold contains 197 atoms of gold. false true question 3 10 pts 0.0500 moles of a metal with the molar mass 207.2 g/mol correspond to _____ grams of that metal. 4140 10.4 207.2 0.000241

Explanation:

Step1: Recall mole - atom relationship

One mole of any substance contains Avogadro's number ($6.022\times 10^{23}$) of atoms, not the molar - mass number of atoms. For gold, the molar mass is approximately 197 g/mol, but one mole of gold contains $6.022\times 10^{23}$ atoms.

Step2: Use mass - mole formula for Question 3

The formula to calculate mass ($m$) from moles ($n$) and molar mass ($M$) is $m = n\times M$. Given $n = 0.0500$ mol and $M=207.2$ g/mol.
$m=0.0500\times207.2 = 10.36\approx10.4$ g

Answer:

Question 2: A. False
Question 3: B. 10.4