A 50.00 g sample of an unknown metal is heated at 45.00°C. It is then placed in a coffee-cup calorimeter filled with water. The calorimeter and the water have combined mass of 250.0•°g an and overall specific heat of 1.035 cal/g•°C. The initial temperature of calorimeter is 10.00°C. The system reaches a final temperature of 11.08°C when the metal is added.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

c.

explanation:

explanation:

0.07 g/cm³

1.37 g/cm³

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.