**Recall the equation used to calculate for osmotic pressure:**

**Calculate the Molarity of the solution:**

Using the van't Hoff factors in the table below, calculate the mass of solute required to make each aqueous solution.

Solute | Expected | Measured |

Nonelectrolyte | 1 | 1 |

NaCl | 2 | 1.9 |

MgSO_{4} | 2 | 1.3 |

MgCl_{2} | 3 | 2.7 |

K_{2}SO_{4} | 3 | 2.6 |

FeCl_{3} | 4 | 3.4 |

Calculate the mass of solute required to make 261 mL of a magnesium sulfate solution that has an osmotic pressure of 3.91 atm at 307 K .

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