Question

A substance has a specific heat capacity of 2.0 J/g °C. How many joules are needed to raise the temperature of 30.0 g of this substance from 0°C to15°C?

a. 1 J

b. -1 J

c. -900 J

d. 900 J

Answer 1

g

Step-by-step explanation:

know what you think about th can get it

Answer 2

`\Large \boxed{\sf 900 \ J}`

Step-by-step explanation:

Use formula

`\displaystyle \sf Energy\ (J)=mass \ (g) * specific \ heat \ capacity \ (Jg^(-1)\°C^(-1)) * change \ in \ temperature \ (\°C)`

Substitute the values in formula and evaluate

`\displaystyle \sf Energy\ (J)=30.0\ g * 2.0 \ Jg^(-1)\°C^(-1) * (15\°C-0\°C)`

`\displaystyle Q=30.0 * 2.0 * (15-0 )=900`