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Dmitry_Shevchenko [17]
3 years ago
15

Convert 1.88•10^-6g to milligrams

Chemistry
1 answer:
Vadim26 [7]3 years ago
8 0
The answer is 1.88·10^-3 mg. 
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mass, and spin

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Lanthanides and Actinides are metals, nonmetals, or metalloids.
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What statement correctly describes the key features of the graph of f(x) = 4(1/2)^(x + 1 )− 3
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Evaluate<br> 0.411 + 9.9 + 0.8<br> and round the answer appropriately,
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3 years ago
If 55.8 ml of bacl2 solution is needed to precipitate all the sulfate ion in a 742 mg sample of na2so4, what is the molarity of
lukranit [14]

Answer is: the molarity of the solution is 0.0936 M.

Balanced chemical reaction: BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq).

Net ionic reaction: Ba²⁺ + SO₄²⁻ → BaSO₄(s).

V(BaCl₂) = 55.8 mL; volume of barium chloride solution.

V(BaCl₂) = 55.8 mL ÷ 1000 mL/L = 0.0558 L.

m(Na₂SO₄) = 742 mg ÷ 1000 mg/g.

m(Na₂SO₄) = 0.742 g; mass of sodium sulfate.

n(Na₂SO₄) = m(Na₂SO₄) ÷ M(Na₂SO₄).

n(Na₂SO₄) = 0.742 g ÷ 142.04 g/mol.

n(Na₂SO₄) = 0.00522 mol; amount of substance.

From chemical reaction: n(Na₂SO₄) : n(BaCl₂) = 1 : 1.

n(BaCl₂) = 0.00522 mol.

c(BaCl₂) = n(BaCl₂) ÷ V(BaCl₂).

c(BaCl₂) = 0.00522 mol ÷ 0.0558 L.

c(BaCl₂) = 0.0936 M.

3 0
3 years ago
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