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4 years ago

What is the molar mass of tetraethyl lead, Pb(C2H5)4? show your work please

1 answer:

4 0

M(Pb(C2H5)4 = M(PB)*1 + 4*( M(C)*2 + M(H)*5)
M(Pb(C2H5)4 = 207.2 + 4(12.0*2 + 1.0*5)
M(Pb(C2H5)4 = 207.2 + 4(28.0 + 5)
M(Pb(C2H5)4 = 207.2 + 4*33
M(Pb(C2H5)4 = 207.2 + 132
M(Pb(C2H5)4 = 339.2 g/mol

Hope this helps !

Photon

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4 years ago

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Answer:

x=8

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Step-by-step explanation:

We know that 6x and 4x+16 are vertical angles, so they are equal

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3 years ago

Roberto took a sample of 5 recent matches for his favorite soccer team. Here is how many goals the team scored in each match: 0,

kap26 [50]

Roberto did not include the first term of the numerator (0-2)^2 in his calculation.

The mean of the data is also known as average.

Given the set of data 0, 2, 1, 2, 5

Mean = 0+2+1+2+5/5

Mean = 10/5

Mean = 2.0

To get the standard deviation, we will use the SD formula as shown:

$\sigma=\sqrt{\frac{\sum (x-\overline x)^2}{N} }$

$\sigma =\sqrt{ \frac{(0-2)^2+(2-2)^2+(1-2)^2+(2-2)^2+(5-2)^2}{5}}\\ \sigma = \sqrt{\frac{4+0+1+0+9}{5}} \\\sigma = \sqrt{\frac{14}{5} }\\\sigma = 1.673$

Comparing this with Roberto's calculation, we can see that Roberto did not include the first term of the numerator (0-2)^2 in his calculation.

Learn more here: brainly.com/question/10557301

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3 years ago