# How many grams of barium hydroxide required to dissolve in 156g of water to make a 0.247m solution?

##### 1 Answer

Jul 2, 2016

**6.60g** of

#### Explanation:

To answer this question, we need two things:

- The molar mass of barium hydroxide, 171.34 g/mol
- The equation for molality:

We are given the molality and mass of solvent. The mass of solvent is expressed in terms of grams and we need kilograms so the following relationship must be used:

1000g = 1kg

Divide 156g by 1000 to obtain 0.156 kg of solvent.

Next, we determine the number of moles of solute (barium hydroxide), by rearranging the equation:

**Moles of solute = Molality x Mass of solvent**

Therefore,

Since we want the mass of

**g**