Question

#9 -/1 point If you need 19.2 grams of HCl for a reaction, and you have a 1.5 M solution of HCI, how many mL of this solution should you use? ml Evaluate If you have 0.38 x 1028 atoms of Zn, what is the mass in kilograms? Mass Zn kilograms Evaluate #5 -/1 point How many hydrogen atoms are in 0.9 kg of water? Hydrogen atoms

Answer 1

I need 19.2 grams of te for a reaction. And I have 1.5 (M) of Hel solutions As we know the molar mass of an Ha= 365. gm/mol so guar bo tua so 1912 gm of Hel = 0.526 mol of 01x380x25:20 Hel. g have 1.5 (M) solution.

soi 1.5 mol of Hel is present in (M 150o this 1000 ml of solution. 0:526 mol of Hel b present in (M) ? 1000x 0.526 me of this solution. solution required =10 looox 0.526 - .. . 1.5 - 350.667 mi i. Required solution - 350.667 ml. # we Know me mola ma> of an & 65.38 gm /mol. so, 1 mol of an contain 6.023x10 no. of n i atoms... But g have 0.38 x 10 no. of n atoms. a sp .. mass of Zn = 65.38 x 0.38x128 6.023x10 23 gm = 412492.11 am = 412.49211 kg.

mass of an = 412.492.11 kg. # 5 The molar mass of water = 18 gm/mus The formula of water = H₂O. so 1 water molecule contain a H atoms. 18 gm of water contain 6.023 x102 no. of water molecules. = (6.023 x 1023x2.) no. of H atoms = 12:046 * 10 23 no. of H atoms: 23 0.9 kg- 900 gm 900 gm of water contain = 12.046x10 23 x 200 18 no. of H atoms = 6.02 x 1025 no. of it atoms. 0.9 kg of water contain 6.02x10 25 no. of H-atoms.