Calculate the mass of nacl in a 35-ml sample of a 1.3 m nacl solution.

= 2.659 g NaCl

Explanation:

Molarity of a substance is given by the formula;

Molarity = moles/Volume in liters

Thus;

Number of moles = Molarity ×  volume in liters

                              = 1.3 M × 0.035 L

                              = 0.0455 Moles

But, the molar mass of NaCl is 58.44 g/mol

The mass of NaCl is therefore;

     = 0.0455 g × 58.44 g/mol

     = 2.659 g NaCl

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

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