Question

a) What is the mass of   1.05×10²⁴atoms of chromium?    grams

b) How many chromium atoms are there in 41.7 grams of chromium?    atom

c) How many MOLECULES of phosphorus triiodide are present in 7.51 grams of this compound?  molecules.

d) How many GRAMS of phosphorus triiodide are present in 3.55×10²²molecules of this compound?  grams.

Answer 1

0 We know that, 1 mole of chromium has a mass of 51.99619. se, 6.028x18 atoms of chromium har a mass of 51.99619. · loosx1024 atons of chromium hay a mass y ? 9. (1.05 x 1024; (5109961) (6.022 X1023) . - 90.66079) ② 1 mode of chromium has Avagadro number (6.022 X10 gg atong, re, 51.9961 g of chromium har 6:0 22X10 number of atome. . 41.7 g of chromium has ? number of atoms. (4179)(6•022x10_) - 4.9995x18 (51.99619) -4183X1023 number of atome ? © We know that, 1 mole PI3 contains 6.022X1023 number of Plz mlecules ie, 4116872 9 of Paz contains 6.022 x10 number of PI y moleculey 7.51 g of Plz contains ? number of PI3 moleculez 2 67.519) (6.022x102), 0.1098x1023 (4114687293 0 . = 1.098 x 102 moleculez. I Similarly, from ©, 6.0 22X102 molecules are present in 4116872 9 & PIZ 3.55x18 molecules are present in ? gg Plz (3.55 X 10 22 (41168729) (6•022x102)) = 24.269173 = 24.879