Year Carbon Emissions (gigatons) Temperature (Fahrenheit) 1960 4.2 57.2

1970 5.8 57

1980 6.2 57.4

1990 7.8 57.6

2000 8 58

2010 9.8 58

Increase carbon dioxide emissions by 0.2 for each step forward for the rest of scenario three.

2020

2030

2040

2050

2060

2070

2080

2090

2100

2110

i believe the answer is true.

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