Question

The chemical formula for hydrogen bromide is HBr. A chemist determined by measurements that 0.045 moles of hydrogen bromide participate in a chemical reaction. Calculate the mass of hydrogen bromide that participates. Round your answer to 2 significant digits

Answer 1

Answer:

Mass = 3. 6 ( 2 significant digits)

Explanation:

Number of moles = 0.045

Mass = ?

Relationship between number of moles and mass is given as;

Number of moles = Mass / molar mass

Mass = Number of moles * Molar mass

Mass = 0.045 * 80.91g/mol

Mass = 3.641

Mass = 3. 6 ( 2 significant digits)