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sweet [91]
4 years ago
13

Why do we use conversion factors instead of just multiplying or dividing as needed? What’s the advantage?

Chemistry
1 answer:
Scrat [10]4 years ago
4 0
If you’re referring to stoichiometry, which usually involves the long t-tables of multiple conversions, then you’re not alone in wondering the purpose of using them. The purpose of conversion tables is to help keep track of what you’re doing. When quickly converting one value to another, it’s very easy to forget a particular piece to the puzzle, or to use a factor that doesn’t work for that instance. Teachers usually draw out a t-table every time they work a problem so as not to confuse students, but anytime you’re working with funky units or converting across systems (metric to imperial and vice versa) it’s a good idea to use them.
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A sample of ethanol (C2H6O) has a mass of 0.2301 g. Complete combustion of this sample causes the temperature of a bomb calorime
Keith_Richards [23]

Answer:  4.994\times 10^{-3}  moles

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass , occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

Given mass of ethanol = 0.2301

Molar mass of ethanol = 46.07 g/mol

\text{Number of moles of ethanol}=\frac{0.2301g}{46.07g/mol}=4.994\times 10^{-3}

Thus there are 4.994\times 10^{-3}  moles of ethanol are present in the sample.

7 0
4 years ago
Read 2 more answers
What information about earthquakes do scientists gain from seismographs?
Anvisha [2.4K]

Answer:

how strong it is

Explanation:

Seismographs are not able to say when earthquake will happen, but they help humans to know how strong it is or if it is happening or not

8 0
3 years ago
Read 2 more answers
Hello, please help tysmmmm!!
Fed [463]

Answer:

2.07

Explanation:

1870=(20.01)(c)(45.2)

1870 = 904.452c

c = 2.07 J/g C (to 3 sf]

3 0
2 years ago
I'm kinda stumped here :/
maria [59]

Answer:

To prepare 20,0 mL of the liquid mixture you should mix 15,3 mL of CHCl₃ with 4,7 mL of CHBr₃

Explanation:

Here you have two variables: The volume of both CHCl₃ (X) and CHBr₃ (Y). To find these two variables you must have, at least, two equations.

You know total volume is 20,0 mL. Thus:

X + Y = 20,0 mL (1)

The other equation  is:

\frac{X}{20,0mL\\} × 1,492 g/mL + \frac{Y}{20,0 mL} × 2,890 g/mL = 1,82 g/mL (2)

If you replace (1) in (2):

\frac{X}{20,0mL\\} × 1,492 g/mL + \frac{20,0 mL - X}{20,0 mL} × 2,890 g/mL = 1,82 g/mL

Solving:

X = 15,3 mL

Thus, using (1):

20,0 mL - 15,3 mL = Y = 4,7 mL

Thus, to prepare 20,0 mL of the liquid mixture you must mix 15,3 mL of CHCl₃ with 4,7 mL of CHBr₃.

I hope it helps!

4 0
3 years ago
Can someone please help me and give an explanation???
Amanda [17]

Convert 278 Kelvin to Celsius

278 Kelvin (K) = 4.850000 Celsius (C)

1 K = -272.150 C

1 C = 274.150 K

More information from the unit converter

Q: How many Kelvin in 1 Celsius?

The answer is 274.150

Q: How many Celsius in 278 Kelvin?

The answer is 4.850000

5 0
3 years ago
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