Specific Heat Capacity of water (1 Viewer)

[Premus]

Hey

just want to confirm this....
in the data sheet ... it says the Specific Heat Capacity of water is
4.18 * 10^3 J / kg / K

In school ive just used 4.18 as the value C and got an answer in Joules.

In the HSC must we use the value in the data sheet? If so, that would mean changing grams of water to kg right?

Thanks

 

[beta-omega]

yeah, it would be safer to use their numbers, even though im sure that if you stated the correct measurements, they would still give you it. And yeah, change the grams of the water to kilos.

 

[mr EaZy]

as long as u know what ur doin and then convert ur units to wat they want, ur fine

 

[Paroissien]

Or it would mean changing the 4.18 x 10^3 j/kg/K to grams giving would 4.18 J/g/K which is where you got your value from, so that method is perfectly acceptable

 

[sneeble]

Waa this thread just confused me =\

If anyone could confirm the following I'd be very appreciative;

4.18x10^3 J/Kg/K refers to the specific heat capacity of water per kilogram, right? Thus if they said to calculate molar heat of combustion, we'd need to change the say 200mL of water to .2kg? And the answer would still be in Joules?

4.18 J/g/K refers to the specific heat capacity of water per gram? So you could simply convert the data sheet value to represent grams, then use 200mL of H2O = 200g?

 

[L45er]

Yeh its wacked. They changed it to SI units so it conformed with protocol shit. But either way, you'll end up with Joules and hopefully the same answer.

 

[Paroissien]

Right on both accounts sneeble.

 

[Xayma]

4.18*10³ J/kgK=4.18J/gK

as 1kg=10³g

Water is only 1g/cm³ at 4°C, but they never seem to care.

 

[sneeble]

Thanks Paroissien