Since its volume you do what it says 55 cm x 100 cm x 80cm and do 100 x 50 which is 5,000. then 5,000 x 80 which is 40,000. sorry i cant show work on here.
No. The number of a protons is not equal to it's atomic weight, instead it is equal to the 'atomic number'
1 mole ----------- 6.02x10²³ atoms
1.75 moles ------- ?
atoms = 1.75 * 6.02x10²³ / 1
= 1.053x10²⁴ atoms
hope this helps!
D all of these I’m about 99% sure
