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
Mamont248 [21]
3 years ago
9

During an investigation, a student burns magnesium to form magnesium oxide. The starting mass of magnesium is measured as 21.3 g

.
2Mg( s)+02( 8) - 2MgO( s)
If the student recovers 30.2 g of magnesium oxide, what is the percent yield? (atomic mass of magnesium = 24.3 amu)
Chemistry
1 answer:
enot [183]3 years ago
3 0

Answer:

Percentage yield = 85.2%

Explanation:

Given data:

Mass of Mg = 21.3 g

Actual yield of MgO = 30.2 g

Percentage yield = ?

Solution:

Chemical equation:

2Mg + O₂ → 2MgO

Number of moles of Mg = mass/molar mass

Number of moles of Mg = 21.3 g / 24.3 g/mol

Number of moles of Mg = 0.88 mol

Now we will compare the moles of MgO with Mg.

                 Mg           :               MgO

                 2               :               2

                0.88             :             0.88

Mass of MgO:           

Mass of MgO= moles × molar mass

Mass of MgO= 0.88 mol × 40.3g/mol

Mass of MgO =  35.46 g

Actual yield of MgO = 30.2 g

Percentage yield:

Percentage yield = Actual yield/theoretical yield × 100

Percentage yield = 30.2 g/ 35.46 g × 100

Percentage yield = 85.2%

You might be interested in
Determine the number of centiliters in 2.4 x 10^3 milliliters.
AnnZ [28]
2.4(10^3)

=2.4*10^3

=2.4*(10*10*10)

=2400 <span>milliliters

To </span>centiliters is<span> 2400mL= <u>240.0000cl. </u> </span>



8 0
3 years ago
1. Why were atoms given the name of "atom" which means "unable to be cut?"
alexandr1967 [171]

Answer:

These particles were considered so small that they were unable to be cut

3 0
3 years ago
Which has more neutrons: Cobalt or Nickel?
Inessa05 [86]

Answer:

Because the most common form of Nickel is Ni-58 while the most common form of Cobalt is Co-59, this means that Cobalt (which is number 27 on the periodic table) has 27 protons and 32 neutrons. Therefore 1 less proton but 2 more neutrons and hence has a greater mass than Nickel.

Explanation:

7 0
2 years ago
if a leaf falls from a tree we assume that it is in free fall and not affected by air resistance, how many force vectors does th
lakkis [162]
Just the force of gravity down. 
7 0
3 years ago
Many people have a tendency to think that heat and temperature are the same thing. However, this is not true. Heat describes A.
enyata [817]

The correct answer is actually  

B) energy that flows from warmer objects to cooler objects.

because temperature is a measure of the average amount of energy possessed by an object due to the random motions of its particles.  Heat is the energy that flows from warmer objects to cooler objects. Heat cannot flow in the opposite direction.

7 0
3 years ago
Read 2 more answers
Other questions:
  • Recording station x has determined that the epicenter of a recent earthquake was 250 km away. no information is available yet fr
    13·2 answers
  • Write the balanced molecular and net ionic equations for the reaction between aluminum metal and silver nitrate. identify the ox
    8·2 answers
  • Glucose and hexanoic acid each contain six carbon atoms, but they have completely different properties. Glucose is a nutrient fo
    14·1 answer
  • Determine a planet from our solar system is located far from the sun. Describe the size and composition of this planet
    11·2 answers
  • When a candle burns it produced 41,300 Joules per 1 gram. Use dimensional analysis to convert this to Calories per pound.
    14·1 answer
  • Calculate the freezing temperature of the following solution of 0.50 M glucose (a covalent compound). Assume that the molality o
    14·1 answer
  • How many times a one pound (2.2 kg) block of iron can be split in half before it stops being iron.
    12·1 answer
  • How many cm 3 are in 0.14 m 3?
    12·1 answer
  • How is a reaction described when a chemical reaction uses up energy?<br>PLZ HELP ASAP PLZ
    15·1 answer
  • When do the highest tides happen?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!