« previous | Item 6 Part C How many grams of H2 are needed to produce 11.61 g of

Question

« previous | Item 6 Part C How many grams of H2 are needed to produce 11.61 g of NHs? Express your answer numerically in grams Learning Goal: To understand how to use stoichiometry to convert between quanfities of reactants and products in chemical vi equations. Figure 1 B11 g H Submit Hints My Answers Give Up Revtew Part Substance A Avondre molar m Part D Teance to mical How many molecules (not moles) of NH3 are produced from 303×10-4 g of H2? Express your answer numerically as the number of molecules. equation Substance Bmumter mular mia molecules

Explanation / Answer

part C )

N2 + 3H2 ---------------------> 2NH3

6g 34g

? 11.61g

hydrogen mass = 6 x 11.61 / 34

= 2.049 g

part D )

H2 moles = 3.03 x 10^-4 / 2 = 1.515 x 10^-4

3 mol H2 ------------------------------> 2 mol NH3

1.515 x 10^-4 --------------------> 1.515 x 10^-4 x 2 / 3 = 1.01 x 10^-4 mol NH3

molecules of NH3 = (6.023 x 10^23) x   1.01 x 10^-4

= 6.083 x 10^19

part D ) tablet problem

molecules = 1.67 x 10^21

part A )

moles = mass / molar mass

= 115 x 10^-3 / 194.2

= 5.92 x 10^-4

part B)

molecules of caffine = 5.92 x 10^-4 x 6.023 x 10^23

= 3.57 x 10^20

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