1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marat540 [252]
2 years ago
5

How many milligrams of magnesium reacts with excess HCl to produce 31.2 mL of hydrogen gas at 754 Torr and 25.0℃.

Chemistry
1 answer:
Ivanshal [37]2 years ago
3 0

Answer:

There will react 30.9 milligrams of magnesium

Explanation:

Step 1: Data given

Volume of hydrogen = 31.2 mL

Pressure = 754 torr = 754/760 = 0.992 atm

Temperature = 25.0 °C = 298 Kelvin

Step 2: The balanced equation

Mg + 2HCl → MgCl2 + H2

Step 3: Calculate moles of H2

p*V = n*R*T

⇒ with p = the pressure of H2 = 0.992 atm

⇒with V = the volume of H2 = 31.2 mL = 0.0312 L

⇒ with n = the moles of H2 = TO BE DETERMINED

⇒ with R = the gas constant = 0.08206 L*atm/K*mol

⇒ with T= the temperature = 25.0 °C = 298 Kelvin

n = (p*V)/(R*T)

n = (0.992*0.0312)/(0.08206*298)

n = 0.00127 moles

Step 4: Calculate moles of Mg

For 1 mol of Mg we need 2 moles of HCl to produce 1 mol of MgCl2 and 1 mol of H2

For 0.00127 moles of H2 we need 0.00127 moles of Mg

Step 5: Calculate mass of Mg

Mass of Mg = moles of Mg * molar mass of Mg

Mass of Mg = 0.00127 moles * 24.3 g/mol

Mass of Mg = 0.0309 grams = 30.9 mg of Mg

There will react 30.9 milligrams of magnesium

You might be interested in
A student performs a reaction that makes aluminum oxide. According to her calculations, she should expect to make 115.2 grams. S
tiny-mole [99]

Answer:

The percentage of the student is 58.17%.

Explanation:

Expected yield of aluminum oxide = 115.2 g

Actual yield of aluminum oxide produced =66.9 g

The percentage yield is calculated by dividing actual yield by expected yield and then multiplying it with hundred.

Percentage yield:

\frac{\text{Actual yield}}{\text{Expected yield}}\times 100

\% Yield=\frac{66.9 g}{115.2 g}\times 100=58.17\%

The percentage of the student is 58.17%.

7 0
3 years ago
CONVERT 2 MOL OF OXYGEN TO ATOMS.<br><br>PLeasee...?
kiruha [24]

Answer:

1.2044 × 10^24 oxygen atoms

Explanation:

To convert from moles to atoms, simply multiply the number of moles by Avogadro's number, 6.022 × 10^23

2 × 6.022 × 10^23

=1.2044 × 10^24

4 0
2 years ago
The most malleable metal is _________
Ostrovityanka [42]

Answer:

Gold

.........

..........

8 0
2 years ago
Read 2 more answers
In the reaction aA + bB &gt;&gt; dD, the lowercase letters represent?
jolli1 [7]

Answer:

Coefficient

Explanation:

Chemical equation:

aA + bB    →   dD

This equation shows that reaction is balanced by coefficient q,b and d.

Reactant    coefficients              Product      Coefficient

A                    a                               D                     d

 B                    b                  

Every balanced equation follow the law of conservation of mass.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass. The numbers 6 with CO₂, 6 with H₂O and 6 with O₂  are coefficient which balance the equation.

8 0
2 years ago
How many moles of methane occupy a volume of 2.00 l at 50.0°c and 0.500 atm answer?
Sauron [17]
Data Given:
                  Pressure  =  P  =  0.5 atm
 
                  Volume  =  V  =  2.0 L

                  Temperature  =  T  =  50 °C + 273  =  323 K

                  Moles  =  n  =  ?

Solution:
              Let suppose the gas is acting Ideally, Then According to Ideal Gas Equation.

                              P V  =  n R T
Solving for n,
                              n  =  P V / R T

Putting Values,
                             n  =  (0.5 atm × 2.0 L) ÷ (0.0821 atm.L.mol⁻¹.K⁻¹ × 323 K)

                             n  =  0.0377 mol
5 0
2 years ago
Other questions:
  • What substance reacts with acid to form hydrogen gas is it one of the below
    6·2 answers
  • How many moles are in 68 grams of copper (ll) hydroxide, Cu(OH)2
    5·2 answers
  • The number if particles in one molecule is?
    13·1 answer
  • PLEASE HELP FAST!! I need someone to see if my answers are correct!
    5·1 answer
  • 5. Which contains more nitrogen: 60g of urea, (NH2)2CO, or 100g of ammonium sulphate, (NH4)2SO4
    13·1 answer
  • What is it?
    7·1 answer
  • Please help me with this question I will make you brainliest!! SCIENCE
    15·1 answer
  • How many questions would you need to separate ten arthropods into different branches
    10·1 answer
  • A diprotic acid (H2X) titrated with a solution of NaOH for 25 ml of the acid 87.42 ml of a 1.95 M solution of NaOH was required
    6·1 answer
  • Which of the following is an empirical formula?<br> H6O2<br> H402<br> H2O<br> H2O2
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!