Answer:
<h3>The answer is 200 cm³</h3>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula
From the question
mass = 150 g
density = 0.75 g/cm³
We have
We have the final answer as
<h3>200 cm³</h3>
Hope this helps you
Using the Bronsted-Lowry (B/L) Theory tell which is the acid and which the base in .... (c) [H+<span>] = </span>8.1x10-10M [OH-] = 1x10-14/8.1x10-10<span> = 0.12x10</span>-4<span> = 1.2x10</span>-5M ... (c) [OH-] = 4.5x10-7M [H+] = 1x10-14/4.5x10-7<span> = 0.22x10</span>-7<span> = 2.2</span>x10<span>-8</span><span>M</span>
Structure 2 is the nucleus.
a) The complete balanced
chemical equation is:
Zn(s) + H2SO4(aq)
--------> ZnSO4(aq) + H2 (g)
<span>b) First we find the amount zinc that has reacted based
on the given H2 produced.</span>
From stoichiometry 1 moles
of Zn is needed for every 1 moles of H2 produced, therefore:
moles(Zn) = moles(H2)
where moles is the ratio
of mass and molar mass (MM)
mass(Zn) / MM(Zn) = mass(H2) / MM(H2)
mass(Zn) = [mass(H2) / MM(H2)] * MM(Zn)
mass(Zn) = [(0.0764 g)/(2 g/mol)] * 65.38 g/mol
mass(Zn) = 2.49 g
So we got 2.49 g pure zinc in the sample so
the purity of zinc is therefore:
purity = (2.49 / 3.86) * 100 % = 64.50 %
<span>c) In part (b) what we need to assume is that in the
impurities in the sample do not react with sulfuric acid to produce hydrogen.
So that the hydrogen is only from the reaction of Zn and sulphuric acid.</span>
