Answer:
When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.
Total weight of alloy is
67 + 20 = 87 g
67 g of which is gold
So % gold is 67/87* 100 = 77.01%
90 oz because 5lbs is equal to 80 oz (5*16=80) plus 10oz = 90
Ba(OH)2 dissociate according to the following equation
Ba(OH)2----> Ba 2+ + 2OH-
Moles of Ba(OH)2 = 4.02 /171(molar mass of Ba(OH)2 )= 0.0235 moles
by use of mole ratio of Ba(OH)2 to OH- which is 1:2 the moles of OH = 0.0235 x 2=0.047 moles in one liter = 0.047/1000= 4.7 x10^-5
POh=- log (OH-)
that is -log (4.7 x10^-5) = 4.34
Ph= 14 - POH
PH is therefore = 14 - 4.34 = 9.66
