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kotykmax [81]
3 years ago
10

Determine the mass of NaOH needed to make 750.0mL of a 6.00 M solution of NaOH

Chemistry
1 answer:
fredd [130]3 years ago
3 0

Answer: 180g

Explanation:

No of moles= volume ×molarity/1000

Volume is given as 750ml

Molarity is given as 6M

Substitute to get the mole

No of moles = 750×6/1000

No of moles= 4.5moles

Remember that

No of moles also = mass given/molar mass

Molar mass of NaOH

Na= 23

O=16

H=1

Molar mass = na +o+h

Molar mass =23+16+1

Molar mass=40g/mol

Substitute

No of moles = mass given/molar mass

Mass = 4.5×40

Mass = 180g

The mass of NaOH needed is 180g

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Cu(s) + 4H⁺(aq) + 4NO₃⁻(aq) ⟶ Cu²⁺(aq) + 2NO₃⁻(aq) + 2NO₂(g) + 2H₂O(ℓ)

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Cu(s) + 4HNO₃(aq) ⟶ Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(ℓ)

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<em>Note</em>: The net ionic equation is <em>the same as </em>the ionic equation because there are <em>no common ions</em> to cancel on opposite sides of the arrow.

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