The first elements to be produced in the laboratory were plutonium and neptunium. Neptunium was produced by bombarding Uranium-238 with neutrons, which led to the
formation of beta particles and neptunium. Which of the following is the most accurate
description of the process?
F. O
238 1
U +
92 0
n-
0 239
e +
Np
-1 93
G
238 1
U + n-
92 0
0 239
e + Np
-1 94
Н.
238 0 1 237
U + e- - n +
Np
92 -1 0 93
1
J. O
238
92
238
U + = n =
0 93
Np +

- decrease the number of plants and animals living in the water.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2