How many Joules are in 2.5 kcal?

A joule is the amount of energy required to accelerate a mass of one $"kilogram"$ by one $"meter/second"^2$ over a distance of one $"meter"$ There is no direct conversion of...

You have 960 J in that many calories. To go from calories to Joules, or vice versa, use the fact that 1 calorie is equivalent to 4.184 J. Use...

So, $148 " calories"xx4.1854 " Joule calorie"^-1$ $=$ $??$ $"Joule"$

So, we do the conversion: $500cancel" Calorie"$ $xx$ $4.1854$ $J*cancel"calorie"^-1$ $=$ $?? J$

It is important to realize that when the term 'nutritional calorie' is used, they mean kilocalorie (= $1000$ calories). It is known that 1 calorie is approximately $4.184$ Joules....

And thus $2930*cancel(kcal)xx4.184*kJ*cancel(kcal^-1)$ $~=12000*kJ$

By definition, $"1 cal"$ is the approximate amount of energy needed to raise the temperature of $"1 g"$ of water by $1^@ "C"$ at $"1 atm"$. In thermochemistry, this...

$"1 calorie"-=4.184*"Joule"$ And thus.....$1.41*kcal-=1.41xx10^3*calxx4.184*J*cal^-1$ $=5899.4*J-=5.90*kJ$....

All science relies on data, and to get these data, we need measurement. I don't know how they measure the ionization energy of magnesium metal, but I know that it...

You gots... $2Cl_2(g) + 7O_2(g) + 130*kcal rarr 2Cl_2O_7(g)$ Another way of writing this is as... $2Cl_2(g) + 7O_2(g) rarr 2Cl_2O_7(g)$ $DeltaH_"rxn"^@=+130*kcal*mol^-1$ And when we write $mol^-1$ we mean per...