Water Density and Q = m x C x ∆T

[Pathfinder]

Hi all,

So the VCAA data booklet (https://www.vcaa.vic.edu.au/Documents/exams/chemistry/chemdata-w.pdf) says the density of water is 0.997 g/mL and I've been using this value in the Q = m x C x ∆T formula to calculate the mass of water when given a volume - my teacher told us to do this as the assessors will no longer accept the previous 1 g/mL value. The data booklet also says that 0.997 is the density "at 25°C", my question is: do we ignore the density calculation if we are not told that the temperature is 25°C or should we continue to use the value at all times (when given the volume)?

Thanks,
Pathfinder.

[Bri MT]

I would assume 25 C unless given a different density to use