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Ganezh [65]
3 years ago
11

The geocentric theory was once accepted as an explanation of how objects were positioned in our solar system. Which statement be

st explains this theory?
A The orbits of the planets are elliptical and not circular

B The Sun is considered to be the center of the Universe

C Earth is considered to be the center of the revolving planets and stars

D The Sun is considered to be the center of the revolving planets and stars
Chemistry
1 answer:
dusya [7]3 years ago
4 0

Answer: c

Explanation:

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sample of substance X has a mass of 326.0 g releases 4325.8 cal when it freezes at its freezing point. If substance X has a mola
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Number of moles ( substance x ):

1 mole --------- 58.45 g/mol
? mole --------- 326.0 g

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Fred mixes a solution using two types of solutions: 0.60 liters containing 10% alcohol and 0.40 liters containing 35% alcohol. W
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The alcohol concentration of the mixed solution is 20%

Simplification :

Based on the given condition, formulate :

35% ×0.40 + 0.6 ×10% ÷{ 0.4+0.6}

Calculate the product :\frac{0.14+0.06}{0.4 + 0.6}

Calculate the sum or difference : \frac{0.2}{1}

Any fraction with denominator 1 is equal to numerator : 0.2

Multiply a number to both numerator, denominator : 0.2 ×\frac{100}{100}

Calculate the product or quotient : \frac{20}{100}

A fraction with denominator equals to 100 to a percentage 20%.

How do you find the concentration of a mixed solution?

In general when your are mixing two different concentrations together first calculate number of moles for each solution (n=CV ,V-in liter) then add them together it will be total moles,then concentration of mixture will be = total moles / total volume(liter).

Learn more about concentration of alcohol :

brainly.com/question/13220698

#SPJ4

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1 year ago
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