1. By the additions of water, 75.0 mL of 6.0 M H2SO4 is diluted to 150.0 mL. What is the concentration of H2SO4 after dilution? A
1.5M

B
3.0M

C
4.8M

D
6.0M

2. Which of the following is an acid-base neutralization reaction?
A
Mg + 2 HCl → MgCl2 + H2

B
SiCl4 → Si + 2 Cl2

C
AgNO3 + KCl → AgCl + KNO3

D
HCl + KOH → KCl + H2O

3. How many grams of HCl are present in 0.70 L of a 0.33 M HCl solution?
A
0.47 g

B
0.54 g

C
2.1 g

D
8.4 g

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation: