Question

5.) how many moles are present in 2.126 g of h₂o₂? (1 point)
0.0625 moles
8.25 moles
6250 moles
0.625 moles

Explanation:

Step1: Calculate molar mass of H₂O₂

The molar mass of H is approximately 1 g/mol and of O is approximately 16 g/mol. For H₂O₂, molar mass $M=(2\times1 + 2\times16)$ g/mol = 34 g/mol.

Step2: Use mole - mass formula

The formula to calculate the number of moles $n$ is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass. Given $m = 2.126$ g and $M=34$ g/mol, then $n=\frac{2.126}{34}=0.0625$ mol.

Answer:

0.0625 moles