1) A lead atom has a mass of 3.4×1022g. How many lead atoms are in a cube of lea
ID: 1006454 • Letter: 1
Question
1) A lead atom has a mass of 3.4×1022g. How many lead atoms are in a cube of lead that has a volume of 9.00 cm3 if the density of lead is 11.3 g/cm3?
2) If the diameter of a sodium atom is 3.14×108cm, how many sodium atoms would fit along a line exactly 2 inch long?
3) Consider an ion with the symbol Y3 formed from a representative element.
What is the electron-dot symbol of the element?
Draw the electron-dot structure for Y.
4) Write the formulas of the compounds formed by specified cations with the following anions: CrO42, CO32, HSO4, PO43
a) Li+
b) Cu2+
c) Ba2+
5) Calculate the [H3O+] of each aqueous solution with the following [OH].
a) baking soda, 1.2×106 M
[H3O+] =?
b)orange juice, 5.1×1011 M
[H3O+] =?
c) milk, 2.2×108 M
[H3O+] =?
d) bleach, 2.5×103 M
[H3O+] =?
e) vinegar, 1.2×1011 M
f) urine, 2.2×109 M
g) ammonia, 5.3×103 M
h) NaOH, 4.2×102 M
[H3O+] =?
b)orange juice, 5.1×1011 M
[H3O+] =?
c) milk, 2.2×108 M
[H3O+] =?
d) bleach, 2.5×103 M
[H3O+] =?
e) vinegar, 1.2×1011 M
f) urine, 2.2×109 M
g) ammonia, 5.3×103 M
h) NaOH, 4.2×102 M
Explanation / Answer
answer 1
find mass of Lead
(9.00 cm3) (11.3 g / cm3) = 101.7 grams of lead
How many lead atoms
(101.7 grams of lead) (1 lead atom / (3.4X10-²² grams) = 2.99 * 10^23 atoms of lead
answer 2
English and SI units of length are connected by this definition
1 in = 2.54 cm exactly
so
2 in * 2.54 cm/in = 5.08 cm
then
5.08 cm / (3.14E-8 cm/atom) = 1.61 E8 atoms
answer 5
a) This equation:
[H+] [OH-] = 1.00 x 10^-14
governs the relationship between hydrogen ion and hydroxide ion in aqueous solution.
We simply substitute into the equation and solve:
[1.2 x 10^-6] [H3O+] = 1.0 x 10^-14
[H3O+] = 8.33 * 10^-9 M
B) 1.96 * 10^-4
do other with same way
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