5. in (3 Points)
Which of the following has the most number of atoms (all in Group 1A):
(Circle the correct answer)
5 g Li (Lithium)
b. 20 g Na (Sodium) 2.1
80 g Rb (Rubidium) 1.4
125 g Cs (Cesium)
All have the same number of atoms
C
a.
d.
f.
45 g K (Potassium)
e.
ii.
(2 points)
Which of the following has the least number of molecules:
(Circle the correct answer)
1 mole of N2 gas
b.
1 mole of O2 gas
1 mole of Cl2 gas
1 mole of Br2 gas
All have the same number of molecules
C.
1 mole of F2 gas
ro ou
e.

How many neutrons does a atom of cobalt have?

What is the subscript for oxygen in its molecular formula

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]