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
Sedaia [141]
2 years ago
5

What is the percent of Cr in Cr203? (Cr = 52.00 amu, O = 16.00 amu) [?]%

Mathematics
1 answer:
choli [55]2 years ago
4 0

Answer:

68.42%

Step-by-step explanation:

We need to find the percent of Cr in Cr_2O_3.

Mass of Cr = 52 amu

Mass of O = 16 amu

Firstly, we will find the molar mass of Cr_2O_3 as follows :

M = 2(52) + 3(16)

M = 152 amu

Percent of Cr in  Cr_2O_3 will be :

Cr=\dfrac{2\times 52}{152}\times 100\\\\=68.42\%

Hence, the required percentage is 68.42%.

You might be interested in
A business executive bought 40 stamps for
alekssr [168]

Answer:

32 33-cent stamps, 8 23-cent stamps

Step-by-step explanation:

In order to solve this question, we need to set up a system of equations. Also known as solving for two variables (the number of each stamp).

Let's set x to be the number of 33-cent stamps. Similarly, let's set y to be the number of 23-cent stamps.

To make our first equation, let's think about the number of stamps total we have. We can say:

x + y =40

<em>(AKA - The number of 33-cent stamps, plus the number of 23-cent stamps, equals 40 stamps.)</em>

Now, let's make an equation for the cost of these stamps.

0.33x + 0.23y = 12.40

<em>(AKA - The cost of the stamps in total, should equal $12.40).</em>

So now, we have our two equations:

x + y =40\\0.33x+0.23y=12.40

If you have a TI-84 graphing calculator, you can go to apps -> polysmlt2 -> simultaneous eqn solver, and then input these equations into the menu. This will solve the problem for you.

If you need to do this manually, let's use substitution. Condense our first equation to make it more substitutable.

x+y=40\\x=40-y

Now, let's put this into our second equation.

0.33x+0.23y=12.40\\0.33(40-y)+0.23y=12.40

Distribute, and solve for y.

13.2-0.33y +0.23y =12.40\\13.2-0.1y=12.40\\-0.1y=-0.8\\y=8

Now, we plug this into one of our equations.

x+y=40\\x+8=40\\x=32

In the end, we have thirty-two 33-cent stamps, and eight 23-cent stamps.

3 0
1 year ago
Please help if you can.
Ronch [10]
Plug -3 into the equation: w(-3)=14-6(-3)
simplify: w(-3)=14+18
solve: w(-3)=32
3 0
3 years ago
suppose a line intersecting two lines a and b forms 35 degree angle with each line. what are the possible relationships between
Andrej [43]

you can conclude that lines A and B are parallel to each other

4 0
3 years ago
an ice cream cone has a height of 16 centimeters and a diameter 4 centimeters.What is the volume of the ice cream cone that can
Rina8888 [55]

Answer:

67.029 cm ³

Step-by-step explanation:

Volume of cone = ¹/³ πr²h

π= 3.142 , r = diameter /2 so r =2cm , height (h) = 16cm

so V = ¹/³ π x (4) x 16

V = 62.029cm³

4 0
3 years ago
I'm thinking of a number. I subtract 4 and then halve the result. The answer is 9. What is the number I am thinking of?
Maru [420]
Hey There

Correct answer: 13

Why? To find this out you need to add 4 to 9 to figure it out

have a good day
4 0
3 years ago
Read 2 more answers
Other questions:
  • Y -13<br> --------- =<br> y -7<br><br> ​
    14·1 answer
  • What is the measure of ∠W, rounded to the nearest degree?
    10·2 answers
  • How many six-digit odd numbers are possible if the leftmost digit cannot be zero
    10·1 answer
  • 41.2 x 1.5. Then explain where the decimal point should go and why
    14·2 answers
  • You are going to mix a gallon bucket of window cleaner. The You are going to mix a gallon bucket of window cleaner. The instruct
    12·1 answer
  • Inequalities sentence: A number w minus 9 is less than or equal to 12
    6·1 answer
  • The sector of a circle has an area of 104pi/9 square inches and a central angle with measure 65 degrees. What is the radius of t
    6·1 answer
  • Which expression below is equivalent to the one below? 3 (2x+5)-(-5x+4)
    5·2 answers
  • Mini Sweets Bakery gives customers 2 free cupcakes for every 20 cupcakes they purchase. Their competitor, Yummy Bites Bakery, gi
    6·1 answer
  • Mike walked 5/8 of the way to school before it started raining. How many percent of the trip did he get before it rained?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!