Given the following equation: Zn + 2HCI - H2 + ZnCl2
How many moles of HCl are needed to react with 0.50
moles of Zn?

To react with 0.5 moles of Zn 1 mole of HCl is required

Explanation:

Given data:

Number of moles of Zn = 0.50 mol

Number of moles of HCl = ?

Chemical equation:

Zn + 2HCl  → H₂ + ZnCl₂

Now we will compare the moles of Zn and HCl through balance chemical equation.

                       Zn         :        HCl

                         1          :            2

                       0.50      :         2×0.5 = 1 mol

In order to react with 0.5 moles of zinc 1 mole of HCl is required.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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there is none because earth is stationary and flat.