Climate researchers in Greenland can use ice core samples to tell them about carbon dioxide in the atmosphere in the past. The researchers have found an ice core sample that shows there was a period when carbon dioxide in the atmosphere decreased. What happened to the amount of energy absorbed by Earth's surface during this time? During this time, the amount of energy absorbed by Earth's surface *

there is none because earth is stationary and flat.

the maximum mass of nh3 is nh3 in grams

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