Question

the melting point of hydrogen is -259°c. the melting point of oxygen is -219°c. how many more degrees is the melting point of oxygen than the melting point of hydrogen?

Explanation:

Step1: Identify the values

Melting - point of hydrogen $a=-259^{\circ}C$, melting - point of oxygen $b = - 219^{\circ}C$.

Step2: Calculate the difference

We want to find $b - a$, so $(-219)-(-259)$. Using the rule $x-(-y)=x + y$, we have $-219 + 259$.
$259-219 = 40$.

Answer:

$40^{\circ}C$