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Hey there!
There are 6.022 x 10²³ atoms of copper in one mole of copper.
So, multiply 6.022 x 10²³ by 3.5.
3.5 x 6.022 x 10²³
21.077 x 10²³
2.1077 x 10²⁴
There are 21.077 atoms in 3.5 moles of Ca.
Hope this helps!
a) m(H₂C₂O₄) = 15.5 g.
n(H₂C₂O₄) = m(H₂C₂O₄) ÷ M(H₂C₂O₄).
n(H₂C₂O₄) = 15.5 g ÷ 90 g/mol.
n(H₂C₂O₄) = 0.172 mol; amount of substance.
N(H₂C₂O₄) = n(H₂C₂O₄) · Na (Avogadro constant).
N(H₂C₂O₄) = 0.172 mol · 6.022·10²³ 1/mol.
N(H₂C₂O₄) = 1.037·10²³; number of molecules.
b) In one molecule of oxalic acid there are two atoms of carbon:
N(C) = 2 · N(H₂C₂O₄).
N(C) = 2 · 1.037·10²³.
N(C) = 2.074·10²³; number of carbon atoms.
Answer:
A phosphorus atom forms a P3- ion by gaining three electrons.
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