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3 years ago

Which statement is true of a chemical change? (Plato)

Chemistry

2 answers:

MrRa [10]3 years ago

6 0

Answer: i think A

Explanation: if i got it right could you mark me as brainliest

OleMash [197]3 years ago

5 0

Answer:

Explanation:

The answer A is the best answer because it contains the most general characteristic of a chemical change.

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Regular treatment with low dose aspirin is used to help prevent cardiovascular disease. How many aspirin molecules are in

gogolik [260]

The number of molecules of aspirin is $4.01\times 10^{20} molecules$

Given:

120. mg of the aspirin

To find:

The molecules of aspirin in 120. mg of aspirin.

Solution

Mass of aspirin = 120. mg

$1mg = 0.001 g\\\\120. mg=120.\times 0.001 g=0.120 g$

Molar mass of aspirin = 180.158 g/mol

Moles of aspirin = $= \frac{0.120 g}{180.158 g/mol}=0.000666 mol$

According to the mole concept:

$1 mole = N_A=6.022\times 10^{23} atoms/molecule/ions$

The molecules of aspirin in 0.000666 moles of aspirin:

$=0.000666\times 6.022\times 10^{23} molecules\\\\=4.01\times 10^{20} molecules$

The number of molecules of aspirin is $4.01\times 10^{20} molecules$ .

Learn more about the mole concept here:

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8 0

2 years ago

Predict the size of the astatine atom compared to that of tellurium

PIT_PIT [208]

<span>Since Astatine is in period 7 and Te is in period 6, I'm going with At because it has 7 energy levels.</span>

6 0

3 years ago

Someone please help me with this

igor_vitrenko [27]

Answer:

I think A should be the answer because oxygen is the chemical change of carbon.

7 0

3 years ago

What does E+mc^2 mean and how it came to be

Shalnov [3]

E = mc^2<span> is an equation derived by the twentieth-century physicist Albert Einstein, in which E represents units of energy, m represents units of mass, and c 2 is the speed of light squared, or multiplied by itself.</span>

4 0

4 years ago

F 15 g of C₂H₆ reacts with 60.0 g of O₂, how many moles of water (H₂O) will be produced? (Hint: use what you know about limiting

Mars2501 [29]

Answer:

1.5 mol H2O

Explanation:

2C2H6 + 7O2 -> 4CO2 + 6H2O

The limiting reactant is C2H6

30 g C2H6 ->1 mol C2H6

15 g C2H6 -> x x= 0.5 mol C2H6

2 mol C2H6 -> 6 mol H2O

0.5 mol c2H6 -> x x = 1.5 mol H2O

4 0

4 years ago