<span>There are three isotopes of hydrogen H-1, H-2, and H-3 all of these isotopes have "One Proton"
Hope this helps!</span>
Molar mass KBr = 119 g/mol
Volume in liters: 250.0mL / 1000 => 0.25 L
n = M x V
n = 1.20 x 0,25 => 0.3 moles of KBr
Therefore:
1 mole KBr ----------- 119 g
0.3 moles KBr -------- ??
0.3 x 119 / 1 => 35.7 g of KBr
Answer:
1 because the last one is 1 and the previous shell was complete.
