не знаю что писать но спс за Hit the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are notified that any dissemination distribution or copying of this email and any attachments is intended only for the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you.
a)
Дано:
P₂O₅.
Найти:
ω (P в P₂O₅) — ?
ω (O в P₂O₅) — ?
1. Найдём молярную массу вещества. Значения берём из таблицы Менделеева.
M (P₂O₅) = 2 · 31 + 5 · 16 = 142 (г/моль).
2. Найдём массовые доли (ω) каждого вещества, используя формулу ω = m (в.-ва) ÷ m (р.-ра) · 100%.
ω (P в P₂O₅) = (2 · 31) ÷ 142 · 100% ≈ 43,7 (%).
ω (O в P₂O₅) = (5 · 16) ÷ 142 · 100% ≈ 56,3 (%).
ответ: 43,7%, 56,3%.
б)
Дано:
Na₂SO₃.
Найти:
ω (Na в Na₂SO₃) — ?
ω (S в Na₂SO₃) — ?
ω (O в Na₂SO₃) — ?
1. Найдём молярную массу вещества. Значения берём из таблицы Менделеева.
M (Na₂SO₃) = 2 · 23 + 32 + 3 · 16 = 126 (г/моль).
2. Найдём массовые доли (ω) каждого вещества, используя формулу ω = m (в.-ва) ÷ m (р.-ра) · 100%.
ω (Na в Na₂SO₃) = (2 · 23) ÷ 126 · 100% ≈ 36,5 (%).
ω (S в Na₂SO₃) = 32 ÷ 126 · 100% ≈ 25,4 (%).
ω (O в Na₂SO₃) = (3 · 16) ÷ 126 · 100% = 38,1 (%).
ответ: 36,5%, 25,4%, 38,1%.
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