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pshichka [43]
3 years ago
8

FIRST TO ANSWER GETS BRAINLIEST! :)

Chemistry
2 answers:
hichkok12 [17]3 years ago
6 0

C- main sequnce

Regulus A is a binary star consisting of a blue-white main sequence star of spectral type B7V, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass.

seropon [69]3 years ago
5 0
The correct answer is c
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What mass of NaCl is dissolved in 150 g of water in a .050<br> msolution?
mart [117]

Answer:

0.4383 g

Explanation:

Molality is defined as the moles of the solute present in 1 kg of the solvent.

It is represented by 'm'.

Thus,  

Molality\ (m)=\frac {Moles\ of\ the\ solute}{Mass\ of\ the\ solvent\ (kg)}

Given that:

Mass of solvent, water = 150 g = 0.15 kg ( 1 g = 0.001 g )

Molality = 0.050 m

So,

0.050=\frac {Moles\ of\ the\ solute}{0.15}

Moles = 0.050\times 0.15\ mol= 0.0075\ mol

Molar mass of NaCl = 58.44 g/mol

Mass = Moles*Molar mass = 0.0075\times 58.44\ g = 0.4383 g

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4 years ago
Which phrase describes a typical feature of plains?
Airida [17]

Answer:

Usually have a low relief, can be interior, and can be coastal.- are phrases that describe typical features of plains.

5 0
3 years ago
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How many moles of C2H2 are needed to react completely with 84.0 mol O2?
Airida [17]
33.6 moles are needed to completely react with 84.0 moles of O2
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3 years ago
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Rashid [163]
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3 years ago
Calculate the molarity of each solution. 28.33 g c6h12o6 in 1.28 l of solution
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Molarity is number of moles of solute in 1 L of solution
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the number of moles in 1.28 L - 0.1574 mol
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4 0
3 years ago
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