PLS HELPP ...All alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide A typical is that between lithium and water: 2Li(s) + 2H2O(l)  2LiOH(aq) + H2(g)

(a) How many moles of H2 can be formed by the complete reaction of 6.23 moles of Li with

water?

(b) How many grams of H2 can be formed by the complete reaction of 80.57 g of Li with

water?

A) 3.115 mol

B) 11.60 g h2

Explanation:

From the equation

2 mol Li gives 1 mol H2

Then 6.23 gives??

6.23 /2 = 3.116 mol H2

B) moles of Li =mass! molar mass

= 80.57/ 6.941 = 11.6 mol Li

Then moles of H2 = 11.6 /2 = 5.8 mol H2

Mass of H2 = mol * molar mass

5.8*2 =11.6 g h2

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the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).