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3 years ago

Determine the formula weight of ca(no₃)₂. provide an answer to two decimal places.

SAT

1 answer:

Ronch [10]3 years ago

5 0

The formula weight of $Ca(NO_3)_2$ is equal to 136.02 g/mol.

The formula weight of a chemical compound is calculated by adding the atomic masses of each chemical element contained in the compound, while multiplying them by the number of atoms respectively.

From the periodic table, the atomic mass of each chemical element is:

Carbon = 12.0107 u

Nitrogen = 14.0067 u

Oxygen = 15.999 u

Formula weight of $Ca(NO_3)_2$ = $12.0107 + [14.0067+ (15.999 \times3)]\times 2$

$F = 12.0107 + [14.0067+ 47.997] \times 2\\\\F = 12.0107 + 124.0074$

F = 136.02 g/mol.

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A single-platter disk has rotation speed 7200 rpm, number of tracks on one side of platter is 30,000, number of sectors per trac

nexus9112 [7]

Answer:

Rotation Speed = 7200 rpm

No. of tracks on one side of platter = 30000

No. of sectors per track = 600

Seek time for every 100 track traversed = 1 ms

To find:

Average Seek Time.

Average Rotational Latency.

Transfer time for a sector. Total Average time to satisfy a request.

Explanation:

a) As given, the disk head starts at track O. At this point the seek time is 0.

Seek time is time to traverse from 0 to 29999 tracks (it makes 30000)

Average Seek Time is the time taken by the head

to move from one track to another/2

29999 / 2 = 14999.5 ms

As the seek time is one ms for every hundred

tracks traversed. So the seek time for 29,999 tracks traversed is

14999.5/100 = 149.995 ms

b) The rotations per minute are 7200

1 min = 60 sec

7200 / 60 = 120 rotations / sec

Rotational delay is the inverses of this. So 1/120 = 0.00833 sec

= 0.00833 * 100

= 0.833 ms

So there is 1 rotation is at every 0.833 ms

Average Rotational latency is one half the amount of time taken by disk to make one revolution or complete 1 rotation.

So average rotational latency is: 1 / 2r

8.333/2 = 4.165 ms

c) No. of sectors per track = 600

Time for one disk rotation = 0.833 ms

So transfer time for a sector is: one disk revolution time / number of sectors

8.333 / 600 = 0.01388 ms = 13.88 μs

d) Total average time to satisfy a request is calculated as :

Average seek time + Average rotational latency + Transfer time for a sector

= 149.99 ms + 4.165 ms + 0.01388 ms

= 154.168 ms

4 0

2 years ago

(5372 + 100y^2) + 5(10y^2 – 110) Add the two polynomials and write in the form ay^2 + b, where a and b are constants, What is th

dangina [55]

Answer:

The value of a is 150 and b is 4822.

Explanation:

First, you have to expand to remove brackets :

$(5372 + 100 {y}^{2} ) + 5(10 {y}^{2} - 110)$

$= 5372 + 100 {y}^{2} + 50 {y}^{2} - 550$

Next, you have to simplify :

$100 {y}^{2} + 50 {y}^{2} + 5372 - 550$

$= 150 {y}^{2} + 4822$

Next, you have to compare it :

$a {y}^{2} + b = 150 {y}^{2} + 4822$

$a = 150$

$b = 4822$

5 0

3 years ago

If f(x)=(x+3)³+4<br> let g(x)=f(x+1)-2<br> find when g(x)=12

Alla [95]

Answer:

Explanation:

g(x) = f(x + 1) - 2

g(x) = (x + 1 + 3)^3 -2

g(x) = (x + 4)^3 - 2

Now what are we supposed to do with this? I'm guessing we are to find what value of x will make g(x) = 12. If I'm wrong, leave a note in the form of a comment.

g(x) = 12

(x + 4)^3 - 2 = 12 Add 2 to both sides.

(x + 4)^3 = 14 Take the cube root of both sides.

x + 4 = cubrt(14)

x + 4 = 2.4101 Subtract 4

x = 2.4101 - 4

x = -1.5899

8 0

2 years ago

Word Bank for #4-8: Read the passage and fill in the blanks using the following terms.

snow_tiger [21]

Answer:

<h2>option d Meiosis</h2>

Explanation:

Term Meaning

Gamete A sex cell (in humans: sperm for males, and eggs for females)

Meiosis A two-step process of cell division that is used to make gametes (sex cells)

Crossing over Process in which homologous chromosomes trade parts

Interphase Phase of the cell cycle where the cell grows and makes a copy of its DNA

Homologous chromosomes Set of chromosomes (one from each parent), that are very similar to one another and have the same size/shape

Sister chromatids Two halves of a duplicated chromosome

Diploid (2n) Cell that contains two sets of homologous chromosomes

Haploid (n) Cell that contains only a single set of genes

Meiosis

The purpose of meiosis is to produce gametes, or sex cells. During meiosis, four daughter cells are produced, each of which are haploid (containing half as many chromosomes as the parent cell).

Stages of meiosis

Meiosis contains two separate cell divisions, meaning that one parent cell can produce four gametes (eggs in females, sperm in males). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.

dont worry that it is too long

it will come like this only

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4 0

3 years ago

What is the minimum value for g(x)=x2−10x+16? enter your answer in the box.

Advocard [28]

To find the maximum and minimum (5,-9)

4 0

2 years ago