contestada

It requires 350 joules to raise a certain amount of a substance from 10.0°C to 30.0°C. The specific heat of the substance is 1.2 J/g°C.

Respuesta :

eTangent
I'll assume you are looking for the mass of the object, since that is the missing piece of the puzzle.

The important equation for heat and energy is

Energy = mass × specific heat × change in temperature

Things we know:
Energy needed is 350 J.
Specific heat = 1.2 J/g°C
Temp. change = (30-20)°

Now we just need to plug those in and rearrange the formula to find the mass!

350 = mass × 1.2 × 10

Answer:

The amount of the substance is 14.6 g.

Explanation:

Given that,

Energy = 350 J

Temperature [tex]T_{1}=10.0^{\circ}\ C[/tex]

Temperature [tex]T_{2}=30.0^{\circ}\ C[/tex]

Specific heat capacity = 1.2 J/g^{/circ}[/tex]

We know that,

The formula of specific heat is defined as

[tex]Q = mc\Delta T[/tex]

Where,

m = mass of the substance

c = specific heat capacity

[tex]\Delta T[/tex] = Temperature change

Put the value into the formula

[tex]350=m\times 1.2\times(30-10)[/tex]

The amount of substance is

[tex]m =\dfrac{350}{1.2\times(30-10)}[/tex]

[tex]m =14.6\ g[/tex]

Hence, The amount of the substance is 14.6 g.