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
tino4ka555 [31]
3 years ago
10

A chemist uses hot hydrogen gas to convert chromium(III) oxide to pure chromium. How many grams of hydrogen are needed to conver

t 76
grams of chromium(III) oxide, Cr203?
Cr2O3 + H2Cr + H2O
Chemistry
1 answer:
Likurg_2 [28]3 years ago
8 0

Answer:

3.0242 g of H2

Explanation:

The balanced equation for the reaction is given as;

Cr2O3 + 3H2 → 2Cr + 3H2O  

From the reaction, the mole ratio between Cr2O3 and H2 is given as;

1 mol of Cr2O3 reacts with 3 mol of H2

Converting to mass using;

Mass = Molar mass * Number of moles

Cr2O3;

Mass = 151.99 g/mol * 1 mol = 151.99 g

H2;

Mass = 2.016 g/mol * 3 mol = 6.048 g

How many grams of hydrogen are needed to convert 76  grams of chromium(III) oxide, Cr203?

151.99 = 6.048

76 = x

x = 76 * 6.048 / 151.99

x = 3.0242 g

You might be interested in
Sodium carbonate reacts with silver nitrate according to the following balanced equation: Na2CO3 (s) + 2 AgNO3 (aq) → Ag2CO3 (s)
klemol [59]

Answer:

a) 2.01 g

Explanation:

  • Na₂CO₃ (s) + 2AgNO₃ (aq) → Ag₂CO₃ (s) + 2NaNO₃

First we <u>convert 0.0302 mol AgNO₃ to Na₂CO₃ moles</u>, in order to <em>calculate how many Na₂CO₃ moles reacted</em>:

  • 0.0302 mol AgNO₃ * \frac{1molNa_2CO_3}{2molAgNO_3}  = 0.0151 mol Na₂CO₃

So the remaining Na₂CO₃ moles are:

  • 0.0340 - 0.0151 = 0.0189 moles Na₂CO₃

Finally we <u>convert Na₂CO₃ moles into grams</u>, using its <em>molar mass</em>:

  • 0.0189 moles Na₂CO₃ * 106 g/mol = 2.003 g Na₂CO₃

The closest answer is option a).

8 0
3 years ago
Which of the following is an example of oxidation? A. Charcoal is placed on a grill and lighting fluid poured over it. B. A car
Vikentia [17]

Answer:

<u>The Answer is (B)  A car get rusty over the course of few years</u>Explanation:

<u>Explanation:</u>

  • <u>Oxidation </u>refers to the process of loss of electrons by a molecule,atom or ion during a chemical reaction.The process which is just the opposite of oxidation is reduction,it occurs when their is gain of electrons .
  • <u>When iron reacts with the oxygen it forms a chemical know as Rust.In this case iron has lost some electrons and the oxygen has gained some electrons</u>

<u></u>

4 0
3 years ago
Nitrogen has an average atomic mass of 14.00674. it has two isotopes, n-14 and n-15, with atomic masses of 14.0031 amu and 15.00
masya89 [10]
In this case, we are going to assume that there are 100 atoms to make things easier. 

Let R% be the abundance of n-15. With this in mind, we calculate the abundance of n-14 to be 100%-R%

14.0031*(100-R)% + 15.001 * R%= 14.00674 
In this case, we can delete or ignore the % sign since we do not want to carry it around, however, we need to keep in mind that the final answer is in %

14.0031*(100-R) + 15.001 * R= 14.00674 
1400.31-14.0031R+15.001R=1400.674
0.9979R=0.364
R=0.3648

Then, the abundance of n-15 is 0.3648%

5 0
3 years ago
An -ate or -ite at the end of a compound name ususally indiates that the compound contains...
Zarrin [17]

Answer: Oxygen.

Explanation: The -ate is used for the ion that has the largest number of Oxygen atoms. The -ite would be used for the ion with the smaller amount of oxygen atoms.

4 0
3 years ago
You need to prepare 150 mL of 0.1 M solution of silver chloride. How much silver chloride is required?
Rudiy27

Answer:

amount of silver chloride required is 0.015 moles or 2.1504 g

Explanation:

0.1M AgCL means 0.1mol/dm³ or 0.1mol/L

1L = 1000mL

if 0.1mol of AgCl is contained in 1000mL of solution

then x will be contained in 150mL of solution

cross multiply to find x

x = (0.1*150)/1000

x= 0.015 moles

moles of silver chloride present in 150 mL of solution is 0.15 moles

To convert this to grams, simply multiply this value by the molar mass of silver chloride

molar mass of silver chloride AgCl =107.86 + 35.5

                                                     =143.36 g/mol

mass of AgCl = moles *molar mass

                       =0.015*143.36

                        =2.1504g

                        =

4 0
3 years ago
Other questions:
  • If oxygen, which has an electronegativity of 3.5, bonds with hydrogen, which
    15·1 answer
  • What would happen to the following endothermic reaction that is in equilibrium if heat is added? N2O4 (g) Two arrows stacked on
    9·2 answers
  • The graph above shows the progress of a chemical reaction. Based on the graph, which of the following is true?
    11·2 answers
  • Sam toured India with his class. He saw many buildings that reminded him of buildings he saw in Saudi Arabia and in London.
    10·2 answers
  • Why do you think the process to create a protected area takes so long?
    11·1 answer
  • If two atoms of sodium combine with one molecule of chlorine which of the following could be a product
    7·1 answer
  • Two forces are described below: Force 1: The force with which Earth pulls a person to its center Force 2: The pulling force appl
    8·2 answers
  • Which of the Following Correctly Balances this Equation? _H2+_Cl2 --&gt; _HCl
    11·1 answer
  • PLEASE HELP QUICKLY! SERIOUS ANSWER PLEASE
    12·1 answer
  • How does matter change phase?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!