Answer:
Excessive use of fertilizers and pesticides by farmers in agriculture to enhance crop yield is detrimental to environment and human health. Fertilizers and pesticides use has led to the problem of air, water and soil pollution.
2Ca + O2 = 2CaO
First, determine which is the excess reactant
72.5 g Ca (1 mol) =1.8089725036
(40.078 g)
65 g O2 (1 mol) =2.0313769611
(15.999g × 2)
Since the ratio of to O2 is 2:1 in the balanced reaction, divide Ca's molar mass by 2 to get 0.9044862518. this isn't necessary because Ca is already obviously the limiting reactant. therefore, O2 is the excess reactant.
Now do the stoichiometry
72.5 g Ca (1 mol Ca) (1 mol O2)
(40.078 g Ca)(2 mol Ca)(31.998g O2)
=0.0282669621 g of O2 left over
The answer is storm surge
Fungi and bacteria-- mushrooms, bacteria, mold...
a) (10.12 g salt) x [(1 mole salt)/(277.85 g salt)] x [(1)/(2.000 L soln)] = 0.0182 M
b) (0.0182 M) x [(1 mole Mg2+)/(1 mole salt)] = 0.0182 M
c) (0.0182 M) x [(3 moles Cl-)/(1 mole salt)] = 0.0546 M
d) [(10.12 g salt)/(2000 mL)] x 100% = 0.506% (w/v)
e) (0.0546 M Cl-)(25.0 mL soln) = 1.36 mmoles Cl-
f) [(0.0182 moles K+) / (1.000 L)] x [(39.10 g K+)/(1 mole K+)] x [(1 L soln)/(1000 g soln)] x (1x10^6) = 712 ppm
