Question
In: Chemistry
A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the...
A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 ∘C and 752 torr, the volume is found to be 305 mL . The vapor pressure of water at 29 ∘C is 30.0 torr.
a. Taking into account the vapor pressure of water, how many moles of hydrogen gas, n, are present in 305 mL at 752 torr and 29 ∘C? The value of the gas constant R is 0.08206 L⋅atm/(mol⋅K). You may also find the conversion factors1 atm=760 torr and TK=TC+273 useful. Express the number of moles to three significant figures.
b. What is the mass percentage of aluminum in this alloy? Express your answer numerically.
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the...
A 0.250-g sample of a magnesium-aluminum alloy dissolves
completely in an excess of HCl(aq). When the liberated H2(g) is
collected over water at 29 ∘C and 752 torr, the volume is found to
be 303 mL . The vapor pressure of water at 29 ∘C is 30.0 torr.
How many moles of H2 can be produced
from x grams of Mg in magnesium-aluminum alloy? The
molar mass ofMg is 24.31 g/mol. Express your answer in terms of
x to four...
QUESTION 1 Magnesium chloride (MgCl2) dissolves completely in water. What is the molarity of the Mg2+(aq)...
QUESTION 1
Magnesium chloride (MgCl2) dissolves completely in
water. What is the molarity of the Mg2+(aq)
cation in a 0.00500 M MgCl2(aq) solution? (3
significant digits, units M)
1 points
QUESTION 2
What is the molarity of Cl-(aq) anion in the
same solution as Question 1? (3 significant digits, units M)
1 points
QUESTION 3
The parts per million (ppm) unit can be expressed as mg solute
per liter solution (mg/L) for dilute aqueous solutions. Convert the
Mg2+(aq)concentration...
a sample of magnesium metal reacts completely with an excess of hydrochloric acid: MG(s) + 2...
a sample of magnesium metal reacts completely with an excess of
hydrochloric acid: MG(s) + 2 HCl (aq) = MgCl2(aq) + H2(g). The
hydrogen gas produced is collected over water at 28.0 C. the volume
of the gas is 46 L and the total pressure in the gas collection
vessel is 1.01 atm. calculate the mass of magnesium metal that
reacted in grams (vapor pressure of water at 28.0 C = 28.2
mmHg)
0.352g of a mixture of aluminum and magnesium metal is reacted with HCl and the gas...
0.352g of a mixture of aluminum and magnesium metal is
reacted with HCl
and the gas produced collected over water at 21.5°C and 755.3mmHg.
The vapor pressure of water at this temperature is 19.2 torr. If
412.5mL of gas is collected, what is the percent of magnesium in
the mixture?
A 8.67−g sample of a Cu-Zn alloy reacts with HCl acid to produce hydrogen gas. If...
A 8.67−g sample of a Cu-Zn alloy reacts with HCl acid to produce
hydrogen gas. If the hydrogen gas has a volume of 1.63 L at 20°C
and 745 mmHg, what is the percent of Zn in the alloy?
How many total moles of ions are released when the following sample dissolves completely in water?
How many total moles of ions are released when the following
sample dissolves completely in water?5.93 × 1018 formula units of LiCl = ______ × 10 _______ mol
Discuss the likely form of a magnesium/lead alloy that doesnt form an intermetallic when magnesium is...
Discuss the likely form of a magnesium/lead alloy that doesnt
form an intermetallic when magnesium is present at low
concentration. Use any relevant information to support your
arguments.
Y2(CO3)3(aq) + HCl(aq) --> YCl3(aq) + CO2(g) + H2O(l) HCl(aq) + NaOH --> NaCl(aq) + H2O(l)...
Y2(CO3)3(aq) + HCl(aq) -->
YCl3(aq) + CO2(g) + H2O(l)
HCl(aq) + NaOH --> NaCl(aq) + H2O(l)
Consider the UNBALANCED equations above. A 0.346 g sample of impure
yttrium carbonate was reacted with 50.0 mL of 0.0965 M HCl. The
excess HCl from the first reaction required 8.84 mL of 0.104 M NaOH
to neutralize it in the second reaction. What was the mass
percentage of yttrium carbonate in the sample?
Reaction of HCl (aq) and Mg(s) to form MgCl2(aq) and H2(g) Given: Molarity of HCL :...
Reaction of HCl (aq) and Mg(s) to form MgCl2(aq) and H2(g)
Given:
Molarity of HCL : 3.00M
volume of HCL: 20.0mL
mass of Mg: 0.036g
volume of gas before placing in equalization chamber: 37.0mL
volume of gas after placing in equalization chamber: 37.5 mL
barometric pressure of the room: 736.4 mmhg
temperature of the room: 18.5 C
------------------------------------------------
Calculate:
mole of Mg reacted:
mole of H2(g) formed:
vapor pressure of vater:
pressure of H2 (Daltons Law):
pressure of H2 in...
When 0.0425 g of magnesium metal were allowed to react with excess hydrochloric acid, 45.80 mL...
When 0.0425 g of magnesium metal were allowed to react with
excess hydrochloric acid, 45.80 mL of hydrogen gas were collected
over water. The barometric pressure at the time was reported to be
29.78 in Hg. The temperature of the water near the mouth of the
eudiometer was 25.1oC. The water level inside the tube was measured
to be 25.24 cm higher than the water level in the beaker.
(g) What is the molar gas volume at STP as determined...
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