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3 years ago

In the equation 3x-3=18 what is x?

Chemistry

2 answers:

Archy [21]3 years ago

4 0

Answer:

x=7

Explanation:

3x-3=18

-3 moves over the 18 side and becomes +3.

18 + 3 =21

3x=21

now you need to divide 3 with 21 giving you 7

Nina [5.8K]3 years ago

3 0

Answer:

The answer is seven bc X is seven.

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The specific heat capacity of concrete is 0.880 J/g °C

nata0808 [166]

Answer:

Solution given:

heat[Q]=?

temperature [T]=0.64°C

specific heat capacity [c]=0.880 J/g °C

mass[m]=3g

we have

Q=mcT=3*0.880*0.64°=1.69Joule

the required heat is 1.69Joule.

5 0

3 years ago

Read 2 more answers

What pressure in mmHg is required to contain 0.02300 mol of nitrogen gas in a 4.200 L container at a temperature of 21.00°C? Rou

kap26 [50]

Answer: 100.3 mmHg

Explanation:

Given that:

Volume of nitrogen gas V = 4.200 L

Temperature T = 21°C

Convert Celsius to Kelvin

(21°C + 273 = 294K)

Pressure P = ?

Number of moles of gas = 0.02300

Molar gas constant R is a constant with a value of 0.0821 atm L K-1 mol-1

Then, apply ideal gas equation

pV = nRT

p x 4.200L = 0.02300 moles x (0.0821 atm L K-1 mol-1 x 294K)

p x 4.200L = 0.555 atm L

p = 0.555 atm L / 4.200L

p = 0.132 atm

Now, convert pressure in atm to mmHg

If 1 atm = 760 mmHg

0.132 atm = (0.132 x 760) = 100.3 mmHg

Thus, 100.3 mmHg of pressure is required

8 0

3 years ago

How many molecules are in 4.00 x 10^2mg of ibuprofen?

Serggg [28]

Start by converting mg to g. There is .001g in every miligram, so there is 0.4g in this sample.

Then find the molar mass of ibuprofen (C13H18O2) which is 206.3g/mol

Then divide grams by the molar mass to get moles of C13H18O2: (0.4g)/(206.3g/mol) = 1.94x10^-3mol C13H18O2

Then multiply moles by Avogadro's number to get molecules: (1.94x10^-3mol)/(6.02x10^23) = 1.17x10^21 molecules of ibuprofen (C13H18O2)

3 0

3 years ago

How many mL of 1.76 M sodium hydroxide solution (strong base) must be added to 0.75

erma4kov [3.2K]

Answer: Special care is required to prepare a solution of sodium hydroxide or NaOH in water because considerable heat is liberated by the exothermic reaction. The solution may splatter or boil. Here is how to make a sodium hydroxide solution safely, along with recipes for several common concentrations of NaOH solution.

Explanation:

Hope this helps!

5 0

3 years ago

A gaseous compound containing carbon and hydrogen was analyzed and found to consist of 83.65% carbon by mass. The molar mass of

steposvetlana [31]

Answer:

The molecular formula is C6H14

Explanation:

Step 1: Data given

Suppose the mass of compound = 100 grams

A compound contains:

Carbon = 83.65 % = 83.65 grams

Hydrogen = 16.35 % = 16.35 grams

Atomic mass of carbon = 12.01 g/mol

Atomic mass of hydrogen = 1.01 g/mol

Molar mass of compound = 86.2 g/mol

Step 2: Calculate moles

Moles = mass / molar mass

Moles carbon = 83.65 grams / 12.01 g/mol

Moles carbon = 6.965 moles

Moles hydrogen = 16.35 grams / 1.01 g/mol

Moles hydrogen = 16.19 moles

Step 3: Calculate mol ratio

We divide by the smallest amount of moles

C: 6.965 moles / 6.965 moles = 1

H = 16.19 moles / 6.965 moles = 2.33

This means for 1 mol C we have 2.33 moles H OR for 3 moles C we have 7 moles H

The empirical formula is C3H7

The molecular mass of this formula is 43.1 g/mol

Step 4: Calculate molecular formula

We have to multiply the empirical formula by n

n = 86.2 g/mol / 43.1 g/mol

n = 2

Molecular formula = 2*(C3H7) = C6H14

The molecular formula is C6H14

7 0

3 years ago