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

Answer:

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

Explanation:

Use formula

$\displaystyle \sf Energy\ (J)=mass \ (g) \times specific \ heat \ capacity \ (Jg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)$

Substitute the values in formula and evaluate

$\displaystyle \sf Energy\ (J)=30.0\ g \times 2.0 \ Jg^{-1}\°C^{-1} \times (15\°C-0\°C)$

$\displaystyle Q=30.0 \times 2.0 \times (15-0 )=900$

Answer 2

Answer:

g

Explanation:

know what you think about th can get it