Question

perform the calculation. 109 j ÷ (20.0 g × 2.51 j/g°c) write your answer with the correct number of significant figures. round if necessary.

Explanation:

Step1: Calculate the denominator

First, calculate $20.0\ g\times2.51\ J/g^{\circ}C$.
$20.0\times2.51 = 50.2\ J/^{\circ}C$

Step2: Perform the division

Then, divide the numerator by the result of step 1.
$109\ J\div(50.2\ J/^{\circ}C)=\frac{109}{50.2}^{\circ}C\approx 2.17^{\circ}C$

Answer:

$2.17^{\circ}C$