What does kcal mean again?

1000 Calories/kilocalorie/large calorie/food calorie

Explanation:

kcal

K comes form the Greek kilo and is the SI prefix for 1000

cal means calorie

so kcal or kilocalorie or large calorie or food calorie

The large calorie, food calorie, or kilocalorie (Cal, calorie or kcal) is the amount of heat needed to cause a one degree Celsius temperature increase in a kilogram of water.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

they are made of gases.

they have a spherical shape.

they make energy through fusion.