Answer:
A
an element made of carbon and oxygen atoms.
Answer:
2nd
Explanation:
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Answer:
Centimeters or milimeters.
Explanation:
The answer depends on the size of the box.
<em>The metric system </em><u><em>base</em></u><em> unit for length is the meter</em>. <em>Centimeters</em> and <em>milimeters</em> are thus also part of the metric system.
If the box is a "regular-sized" box that we use to put stuff in (books, presents, etc), then centimeters would be the most appropiate.
If we're talking about those tiny boxes that are printed on paper (for example in some notebooks) then milimeters would be the most appropiate.
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Answer is: concentration of the sodium hydroxide solution is 2M.
Balanced chemical reaction:
3NaOH(aq) + Cr(NO₃)₃(aq) → Cr(OH)₃(s) + 3NaNO₃(aq).
m(Cr(OH)₃) = 2.06 g.
n(Cr(OH)₃) =2.06 g ÷ 103 g/mol.
n(Cr(OH)₃) = 0.02 mol.
From reaction: n(Cr(OH)₃) : n(NaOH) = 1 : 3.
n(NaOH) = 0.06 mol.
From chemical reaction: NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l):
n(HCl) = n(NaOH) = 0.1 L · 0.4 M = 0.04 mol.
n(NaOH) = 0.06 mol + 0.04 mol = 0.1 mol.
c(NaOH) = 0.1 mol ÷ 0.05 L = 2 mol/L.
