luciephillips2 luciephillips2
  • 25-04-2021
  • Chemistry
contestada

How many grams of KBr is required to prepare 100 mL of
2.0 M KBr solution?

Respuesta :

Scjd
Scjd Scjd
  • 26-04-2021

Answer:

23.8g

Explanation :

Convert 2.0M into mol using mol= concentration x volume

2.0M x 0.1L (convert 100mL to L since the units for M is mol/L)

= 0.2 mol

We can now find grams by using the molar mass of KBr

=119.023 g/mol (Found online) webqc.org

but can be be calculated by using the molecular weight of K and Br found on the periodic table

We can now calculate the grams by using grams=mol x molar mass

119.023g/mol x 0.2mol

= 23.8046 g

=23.8g (rounded to 1decimal place)

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