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USPshnik [31]
3 years ago
15

A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass. What is the empirical formula of this compound?

Mathematics
1 answer:
astraxan [27]3 years ago
8 0

Answer:

3

Step-by-step explanation:

Explanation:

Although you have not been provided with direct masses, you can use the percentage composition values in place of masses.

First, calculate the number of moles of each element:

This is the formula for the ionic compound calcium carbonate, confirming that our result is indeed in the magnitude of a plausible answer. In fact, given the fact that calcium carbonate is ionic, it is also true that this empirical formula equates to the unit formula of the compound.

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Help me please and thanks
leva [86]

Answer:

  A.  (1, -4)

Step-by-step explanation:

You can try the answers to see which works. (The first one does.)

Or, you can solve the equations algebraically. Equating y-values works well here:

  2x -6 = -2x -2

  4x = 4 . . . . . . . add 2x+6 to both sides; next divide by 4

  x = 1 . . . . . . . . shows you selection A is correct

___

A graphing calculator can show you the point of intersection. Perhaps this is the way to go, since the unit seems to be on graphing systems of equations. Both of these equations are in slope-intercept form (y=mx+b), so are easily graphed by starting from the y-intercept (b) and using the slope (m=rise/run) to find another point on the line.

3 0
3 years ago
What is the y-intercept of the line shown?
Vaselesa [24]

Answer:

-1

Step-by-step explanation:

you find where the line crosses the y-intercept

8 0
3 years ago
Read 2 more answers
Janie was given (-2, 3) as the endpoint of a line segment and (0,1) as its midpoint, which ordered pair should Janie choose as h
MaRussiya [10]
When given two end points of a segment say for example (X1,Y1) and (X2,Y2) to get the midpoint of the line or the segment we use the formula,
 midpoint =( (X1+X2)/2 , (Y1+Y2)/2 )
therefore in our case the midpoint is (0,1)
hence, (-2 + X2)/ 2 = 0, thus X2 = 2
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Therefore the other end point will be (2,-1). Thus none of the above paper can be used as the other end point.
8 0
3 years ago
10 times 0.63 repeating
Usimov [2.4K]

Answer:

6.36363

Step-by-step explanation:

6 0
3 years ago
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nhan is getting dressed. he considers 2 shirts, 3 pants and 3 different pairs of shoes. he chooses one of each of the articles a
Alex
3/8 because 2+3+3=8. One pair of pants, one pair of shirt and one pair of shoes =3
6 0
3 years ago
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