Which of the following statements is correct in regards to density? pressure is directly proportional to density. pressure is inversely proportional to density. temperature is directly proportional to density. temperature and pressure do not affect density.

Density is defined as the ratio of mass to the amount of matter i.e. volume.

The mathematical expression is given as:

Now, from the mathematical expression, density is inversely proportional to volume and directly proportional to mass implies with decrease in volume, density is also decreases and with increase in mass, density is also increases.

Low volume (compression) is due to high pressure, results in increase in density and high temperature results large volume (expansion) implies temperature is inversely proportional to density.

Thus, pressure is directly related to density implies increase in pressure results in increase in density.

Hence, first option is the correct answer.

i don t now

"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"