Answer: 4.20 g
Explanation
Since this is a gas, 1 mole must equal 22.4 L, so we must first find how many moles 2.046 L of NO2 is.
1 —> 22.4
x —> 2.046
Then x must equal 0.09134.
The molar mass of NO2 is 46
Remember that moles = mass/ molar mass.
Therefore, 0.09134 = x/46
x = 0.09134 x 46
x= 4.20 g
Hope this helps :)
