Magnesium reacts with hydrochloric acid (HCl) as follows. mc025-1.jpg How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP? 0.448 mL 0.45 mL 448 mL 450 mL
Answers
Answer: 448 mL of hydrogen gas.
Solution:
Now,according to reaction
1 mole of magnesium produces one mole of hydrogen gas.
Then 0.020 moles of magnesium will produce 0.020 moles of hydrogen gas.
Moles of gas : 0.020 mol
At STP, 1 mol of gas occupies 22.4 L
So volume of 0.020 mol of produced at STP :
= 22.4/times 0.020 = 0.448 L = 448 mL (1L=1000mL)
Answer:
The answer is D 450
Explanation:
I just did the quiz
Related Questions
Explain the iodine clock reaction.
Ernest Rutherford's gold-foil experiment showed which of the following?
Which of the following is not a state of matter?A. solidB. liquidC. waterD. plasma
What information does a chemical formula of a compound provide?a. The type and amount of elements b. The different kinds of compounds included within the chemical formula c. The types of molecules present in a formula d. The correct amounts of substances to mix together to make a formula
Answers
Answer: 28.1 amu
Explanation:
Mass of isotope 1 = 27.98 amu
% abundance of isotope 1 = 92.21% =
Mass of isotope 2 = 28.98 amu
% abundance of isotope 2 = 4.70% =
Mass of isotope 3 = 29.97 amu
% abundance of isotope 2 = 3.09% =
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of silicon is 28.1 amu
B) melting point
C) solubility
D) temperature
Answers
Answer:
a
Explanation:
because the Styrofoam cup is less dense than the water it floats and because the nail is more dense it sinks
Answers
velocity = distance/time = 10km/32.5 mins = 0.3125 km/min
Convert this value to miles per hour using the conversion factors for minutes to hours and kilometers to miles as requested by the problem. This gives an answer of 11.47 miles per hour.
0.3125 km/min x 60 mins./ 1 hour x 1 mile / 1.609 km = 11.47 miles/hour
b. 0 °C
c. 100 °C
d. 120 °C
Answers
Cu(s) + S(s) CuS(s)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l)
Ag+(aq) + I-(aq) AgI2(s)
NextReset
Answers
Answer : Option A) .
Explanation : The reaction of hydrogen gas with iodine in solid phase will react most rapidly at standard conditions.
A rapid chemical reaction is one where reactants react fast with each other to give the products at the standard temperature and pressure conditions.
In the given choices Iodine is highly reactive as it belongs to the halogen group and also atomic hydrogen is very reactive in nature, when both combine it gives hydrogen iodide which is much stable in nature than the reactants.
when one mole of hydrogen reacts with one mole of iodine it produces 2 moles of hydrogen iodide.
.
H2(g) + I2(s) 2HI(g)
The reaction that do not occur rapidly at standard conditions are
Cu(s) + S(s) CuS(s)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l)
Ag+(aq) + I-(aq) AgI2(s)
Which of the following is a correct equilibrium expression?
A.
`"K"_("eq") = (["KOH"]^4["O"_2]^3)/(["KO"_2]^4["H"_2"O"]^2)`
B.
`"K"_("eq") = (["H"_2"O"]^2)/(["O"_2]^3)`
C.
`"K"_("eq") = (["KO"_2]^4["H"_2"O"]^2)/(["KOH"]^4["O"_2]^3)`
D.
`"K"_("eq") = (["O"_2]^3)/(["H"_2"O"]^2)`
Answers
Answer:
Answer is option D
Explanation:
The explanation is embedded in the word document attached
Answer:
Keq= [KOH]^4 [O2]^3/[[KO2]^4
Explanation:
4KO2(s) + 2H2O(l) → 4KOH(s) + 3O2(g)
Looking at the equation, the correct equilibrium expression is shown in the answer. The equilibrium constant for a reaction is given by the active masses of species involved in the reaction. The relative molar coefficients of species are raised to the power of their molar concentrations to give the active mass of each specie. This active mass now goes into the equilibrium equation.
Water is not included in the equilibrium equation because, as a solvent, it is present in large excess.