Arya observes that the grass behind her house is dry. she believes the water content in the soil is about two-thirds lower than that of other yards in the area. she's also convinced that the grass is dry because of the slope of her yard. she investigates the problem by following the scientific method. place the steps she takes in the correct order in the flowchart.
she takes samples of the soil.
she runs tests to compare her soil
samples to other soil in the area.
she asks herself why the grass appears so dry.
she discusses the results with her

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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