Respuesta :

Answer:

The mass of 0.40 moles NaBH4 is 15.14 grams

Explanation:

Step 1: Data given

sodium borohydride = NaBH4

Number of moles sodium borohydride = 0.40 moles

Atomic mass of Na = 22.99 g/mol

Atomic mass of B = 10.81 g/mol

Atomic mass of H = 1.01 g/mol

Step 2: Calculate the molar mass of NaBH4

Molar mass = 22.99 g/mol + 10.81 g/mol + 4*1.01 g/mol

Molar mass NaBH4 = 37.84 g/mol

Step 3: Calculate mass of NaBH4

Mass NaBH4 = moles NaBH4 * molar mass NaBH4

Mass NaBH4 = 0.40 moles NaBH4 * 37.84 g/mol

Mass NaBH4 = 15.136 grams  ≈ 15.14 grams of NaBH4

The mass of 0.40 moles NaBH4 is 15.14 grams

adioabiola

The mass in grams of 0.40 moles of sodium borohydride is; 15.124g

The chemical formula of sodium borohydride is; NaBH4.

  • Na = 23g/mol
  • B = 10.81g/mol
  • H = 1g/mol

The molar mass of sodium borohydride, NaBH4 is;

  • Molar mass = 23 + 10.81 + (1×4)

  • Molar mass = 37.81 g/mol

From Mass = no. of moles × molar mass.

The mass of 0.40 moles of sodium borohydride is therefore;

  • Mass = 0.40 × 37.81

  • Mass = 15.124 g

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