Question

2agno₃ + cacl₂ → 2agcl + ca(no₃)₂
the reaction began with 30.00 g cacl₂
and 26.13 g cacl₂ were used up during
the process. how much cacl₂ remains?
? g cacl₂

Explanation:

Step1: Identify initial and used mass

Initial mass of $\ce{CaCl2}$: $30.00\ \text{g}$
Mass of $\ce{CaCl2}$ used: $26.13\ \text{g}$

Step2: Calculate remaining mass

Subtract used mass from initial mass:
$30.00 - 26.13 = 3.87$

Answer:

$3.87$