Ill give u brainliest and all my points! pls

explain using complete sentences where on the hr diagram you would expect to find a main sequence star based on its physical properties.
( has to be 2-4 sentences)

http://www.atnf.csiro.au/outreach/education/senior/cosmicengine/stars_hrdiagram.html. This will give u the answer, just go to link

there are about seven isomers of c4h10o

explanation:

we know from the formula that these isomers contain no rings or double bonds.

the isomers must be alcohols and ethers.

let's start by drawing the alcohols.

start with four carbons in a row and put an   "oh" group in every possible position.

this gives us :

( note that all these 3's and 2's are supposed to come down not up)

1.ch ³ch²ch²ch²oh, butan 1-ol  

2. ch³ch²ch(oh)ch³, butan 2-ol

now use a 3-carbon chain with a   ch ³ on the middle carbon.

this gives us :

1. (ch³)²chch²oh, 2-methylpropan-1-ol

2. (ch³)³coh 2-methylpropan-2-ol.

now for the ethers.

let's start with five atoms in a row.

this gives us :

1.ch³ch²och²ch³, ethoxyethane

finally, the only choice for a branched-chain ether is

2. (ch³)²choch³, 2-methoxpropane.

and there are your seven isomers of c4h10o