# How many joules are required to heat 15.2 g of water at 35.0°C to 70.0°C?

##### 1 Answer

#### Explanation:

In order to be able to determine how much heat is required to increase the temperature of your sample of water from

As you know, a substance's *specific heat* tells you how much heat is required to increase the temperature of

Water has a specific heat of about

Now, here's how you can think about what's going on here. in order to increase the temperature of **times more heat** than water's specific heat value.

Likewise, in order to increase the temperature of **times more heat** than water's specific heat value.

In your case, you need to increase the temperature of **times more heat** than water's specific heat value.

Mathematically, this is expressed as

#color(blue)(q = m * c * DeltaT)" "# , where

*final temperature* minus *initial temperature*

Plug in your values to get

#q = 15.2 color(red)(cancel(color(black)("g"))) * 4.18"J"/(color(red)(cancel(color(black)("g"))) color(red)(cancel(color(black)(""^@"C")))) * (70.0 - 35.0)color(red)(cancel(color(black)(""^@"C")))#

#q = "2223.76 J"#

Rounded to three sig figs, the answer will be

#q = color(green)("2,220 J")#