What is the density of a metal cube that is 1.30 cm in length and has a mass of 8.402 g.

3.824g/cm³

Explanation:

The density of a substance can be calculated using:

Density = mass/volume

The volume of of a metal cube that is 1.30 cm in length is:

Volume = 1.3cm × 1.3cm × 1.3cm

V = 2.197cm³

Since mass = 8.402 g and volume = 2.197cm³

Density = 8.402/2.197

Density = 3.824g/cm³

the answer would be c

"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"