If 20 ml of gas is subjected to a temperature change from 10°c to 100°c and a pressure change from 1 atm to 10 atm, the new volume to the correct number of significant digits is: 3 ml 2 ml 24 ml 13 ml none of these choices

Therefore, the final volume of the gas will be 3 ml.

Explanation: Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 1 atm

= final pressure of gas = 10 atm

= initial volume of gas = 20 ml

= final volume of gas = ?

= initial temperature of gas =

= final temperature of gas =

Now put all the given values in the above equation, we get the final pressure of gas.

The answer must contain the same number of significant digits as contained in the least precise term.

Therefore, the final volume of the gas will be 3 ml.

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.

they are all solids.