Question

A 67.2 g sample of a gold and palladium alloy contains
2.64×10^{23} atoms . What is the mass percent of the gold
in the alloy? What is the mass percent of the palladium in the
alloy?

Answer #1

Compute the number of gold atoms per cubic centimeter for a
silver-gold alloy that contains 10 wt% Au and 90 wt% Ag. The
densities of pure gold and silver are 19.32 and 10.49
g/cm3, respectively.

A titanium cube contains 3.15 ×1023 atoms. The density of
titanium is 4.50 g/cm3. What is the edge length of the cube?

1. The 69.5-g sample of the compound X3O4
contains 19.2 g of oxygen atoms. What is the molar mass of element
X?
? g/mol
2. Calculate the percent composition by mass of each element in
NaClO4?
% Na = ? %
% Cl = ? %
% O = ? %
3. How many grams of Br are in 505 g of CaBr2?
? g

Red gold is a gold‑copper alloy used to make jewelry. A piece of
jewelry made of red gold weighs 7.03 g7.03 g and has a volume of
0.483 cm30.483 cm3. Gold has a density of 19.3 g/cm319.3 g/cm3 and
copper has a density of 8.96 g/cm38.96 g/cm3. Calculate the
percentage by mass of each metal in the jewelry. Assume the total
volume of the jewelry is the sum of the volumes of the two metals
it contains.
A) What is...

Gold forms a substitutional solid solution with silver. Compute
the number of gold atoms per cubic centimeter for a silver-gold
alloy that contains 24 wt% Au and 76 wt% Ag. The densities of pure
gold and silver are 19.32 and 10.49 g/cm3, respectively. The atomic
weight of Au is 196.97 g/mol.

Gold forms a substitutional solid solution with silver.
Compute the number of gold atoms per cubic centimeter for a
silver-gold alloy that contains 10 wt% Au and 90 wt% Ag. The
densities of pure gold and silver are 19.32 and 10.49 g/cm3,
respectively. Please show equations used and calculations
thank you

Red gold is a gold‑copper alloy used to make jewelry. A piece of
jewelry made of red gold weighs 9.87 g9.87 g and has a volume of
0.559 cm30.559 cm3. Gold has a density of 19.3 g/cm319.3 g/cm3 and
copper has a density of 8.96 g/cm38.96 g/cm3. Calculate the
percentage by mass of each metal in the jewelry. Assume the total
volume of the jewelry is the sum of the volumes of the two metals
it contains.
gold:
%
copper:...

A 100−g sample of HgO contains 92.6 g mercury and 7.4 g oxygen.
What mass of mercury atoms and what mass of oxygen atoms are
contained in any 100−g sample of HgO?
___grams Hg atoms
___grams O atoms

The British gold sovereign coin is an alloy of gold and copper
having a total mass of 7.988 g, and is 22-karat gold.
(a) Find the mass of gold in the sovereign in kilograms using
the fact that the number of karats = 24 ✕ (mass of gold)/(total
mass).
kg
(b) Calculate the volumes of gold and copper, respectively, used to
manufacture the coin.
volume of gold
m3
volume of copper
m3
(c) Calculate the density of the British sovereign...

Gold has a molar mass of 197 g/mol. (a) How many moles of gold
are in a 3.51 g sample of pure gold? (b) How many atoms are in the
sample?

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