How many moles of hydrogen are produced from the reaction of 3.5 moles of zinc with excess
hydrochloric acid (HCI)?

The answer to your question is 3.5 moles of H₂

Explanation:

Data

moles of H₂ = ?

moles of Zn = 3.5 moles

moles of HCl = excess

Process

1.- Write the balanced chemical reaction

             Zn  +  2HCl  ⇒   ZnCl₂  +  H₂

  Reactants         Elements     Products

           1                     Zn                  1

           2                    Cl                   2

           2                    H                    2

2.- Use the coefficients of the balanced reaction to calculate the moles of H₂

               1 mol of Zn 1 mol of H₂

             3.5 moles of Zn  x

                              x = (3.5 x 1)/1

                              x = 3.5 moles of H₂

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.