I answered all of them except 2 for you to do
Hope this helps :))
C = 4 mol/l
v = 0.5 l
n(NaCl)=cv
n(NaCl) = 4 mol/l · 0.5 l = 2 mol
2 moles of NaCl must be dissolved
<span>Okay then I would go with choice B since fusion takes place in the sun which is a giant star.</span>