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Elenna [48]
4 years ago
11

5x^2 + 3×^2-x+7xHelp plz​

Chemistry
1 answer:
PSYCHO15rus [73]4 years ago
3 0

Answer:

5x^2 + 3x^2 -x +7x

5x^2+3x^2+6x = 8x^2+6x

factorize it to get

2x(4x+3)

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What do you mean by mixture? give two examples? ​
Orlov [11]

Answer:

mixture is the combination of more than two atom with fixed ratio. for eg Co2, 02

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3 years ago
If a compound contain 40% sulphur and 59% oxygen ,find its empirical formula.
elixir [45]

Answer:

SO3

Explanation:

Data obtained from the question include:

S = 40%

O = 59%

To obtain the empirical formula, do the following:

Divide the above by their molar mass as shown below:

S = 40/32 = 1.25

O = 59/16 = 3.69

Next, divide by the smallest as shown below:

S = 1.25/125 = 1

O = 3.69/1.25 = 3

Therefore, the empirical formula is SO3

8 0
3 years ago
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How many moles is 24 grams of carbon?
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N=24/12
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Gold cylinder has a mass of 75 g and a specific heat of 0.129J/G degrees Celsius it is heated to 65°C and then put in 500 g of w
nadezda [96]
<h3>Answer:</h3>

89.88° C

<h3>Explanation:</h3>

<u>We are given;</u>

  • Mass of gold cylinder as 75 g
  • specific heat of gold is 0.129 J/g°C
  • Initial temperature of gold cylinder is 65°C
  • Mass of water is 500 g
  • Initial temperature of water is 90 °C

We are required to calculate the final temperature;

  • We know that Quantity of heat is given by the product of mass, specific heat capacity and change in temperature.
  • That is, Q = m × c × ΔT
<h3>Step 1: Calculate the quantity of heat absorbed by the Gold cylinder</h3>

Assuming the final temperature is X° C

Then; ΔT = (X-65)°C

Therefore;

Q = 75 g × 0.129 J/g°C × (X-65)°C

   = 9.675X - 628.875 Joules

<h3>Step 2: Calculate the quantity of heat released by water</h3>

Taking the final temperature as X° C

Change in temperature, ΔT = (90 - X)° C

Specific heat capacity of water is 4.184 J/g°C

Therefore;

Q = 500 g × 4.184 J/g°C × (90 - X)° C

  = 188,280 -2092X joules

<h3>Step 3: Calculate the final temperature, X°C</h3>

we know that the heat gained by gold cylinder is equal to the heat released by water.

9.675X - 628.875 Joules = 188,280 -2092X joules

2101.675 X = 188908.875

              X = 89.88° C

Thus, the final temperature is 89.88° C

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What did the name carbon come from
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<span>The English name carbon comes from the Latin carbo for coal and charcoal.</span>
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