Question

A sample with a molar mass of 34.00 g/mol is found to consist of 0.44g of hydrogen and 6.92g of oxygen. Find its molecular formula.

Answer 1

To find the molecular formula, we need to determine the ratio of moles between the elements in the compound. In this case, the compound consists of 0.44 g of hydrogen and 6.92 g of oxygen, and the molar mass is 34.00 g/mol. The molecular formula of the compound is H2O, which represents water.

Step-by-step explanation:

To find the molecular formula of a compound with a given molar mass and the masses of its constituent elements, we need to determine the ratio of moles between the elements in the compound. In this case, the molar mass of the compound is 34.00 g/mol and it consists of 0.44 g of hydrogen and 6.92 g of oxygen.

From the given information, we can calculate the moles of hydrogen and oxygen:

1. moles of hydrogen = mass of hydrogen / molar mass of hydrogen = 0.44 g / 1.008 g/mol = 0.436 mol
2. moles of oxygen = mass of oxygen / molar mass of oxygen = 6.92 g / 16.00 g/mol = 0.4325 mol

Since the moles of hydrogen and oxygen are approximately equal, the molecular formula of the compound is H2O, which represents water.