When is it okay to use Q = mcΔT Q = m c Δ T, is the equation only for calorimetry questions? When a question talks about heat how do I know if i'm measuring ΔH Δ H or Q?

2020年5月1日 · I am confused as to when exactly I should use the mass of the entire solution instead of the mass of the reactants in my Q = mc∆T and ∆H = ±Q/n calculations. Ideally, you always take the mass of the entire solution, and the heat capacity of the product mixture.

2023年2月20日 · The formula for phase changes would q=mcat, with q being the heat, m being mass, c heat capacity, and t for temperature. Rearranging the equation to solve for any of these variables.

More accurately : \Delta Q = mc\Delta T ΔQ = mcΔT \Delta Q ΔQ has units of joules .The base unit of mass is the kilogram - 1 gram is 10^-3 kg and you need to stick to this. Units of \Delta T ΔT would be kelvins obviously. To get a consistent equation where the units on both sides must match up you would need c to have units of Jkg^ {-1}K^ {-1} J kg−1K −1 - you got the units of …

2024年2月19日 · Q=mCAT is for when the substance has its mass given and the other Q=CAT is for the when the number of moles are given. You could also choose equations based on whether the problem gives you the specific heat capacity or the molar heat capacity.

2021年1月28日 · You would use the equation q=mC. Remember that is the change in temperature so you would subtract the final temperature with the initial temperature. Then plug in values, mass*specific heat* (final temp - initial temp) and solve for the final temperature.

2018年1月22日 · q = MCAT when you are heating/cooling an object q = fus or vap when there is a phase change. For example, a combined question could ask you to heat an object from -52 degrees Celsius to 298 degrees Celsius. You would use q=MCAT when an object is being heated/cooled, and q = nDeltaH for phase changes then add everything together.

2018年10月18日 · Basically, using q=mcat (m is mass of water, 45, plus mass of solution, 5) to find q of 5 grams CaClX2 C a C l X 2 and 45 ml water, and then, assuming if we double the mass we double the q, work backwards? (If my logic is wrong, I think it occurs in this assumption) thus, since we need 10 grams and 40 ml in the end, the mass is still 50 grams, but the 2789 is …

2015年1月27日 · how do we know when to use q=nc delta t or q= mc delta t basically when do we have to use moles or grams and is there a way to easily distinguish between the two?! thank you SO much for your help its greatly appreciated

2022年1月28日 · Re: q=mc deltaT vs q= -mc deltaT Postby Cassidy Chiong 2J » Sat Jan 29, 2022 5:19 am A negative q value is used when something is releasing energy, and a positive q value is used when something is absorbing energy. For example, in a calorimeter problem, say a reaction is occurring in water and the water increases in temperature.