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kotegsom [21]
3 years ago
14

What is the distance from earth to Neptune in standard notation and scientific notation.

Chemistry
2 answers:
Hitman42 [59]3 years ago
5 0
I agree with the person above me it seems very accurate i checked
ira [324]3 years ago
4 0

Answer:

Scientific Notation: 4.45963 x 109 km (29.811 A.U.) Scientific Notation: 4.53687 x 109 km (30.327 A.U.) By Comparison: If you weigh 100 pounds on Earth, you would weigh 110 pounds on Neptune.

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A 0.590 gram sample of a metal, M, reacts completely with sulfuric acid according to:
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Vapor pressure of water at 25^oC  = 23.78 torr

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To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:

PV=nRT

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V = Volume of the gas = 255 mL = 0.255 L ( 1 mL = 0.001 L )

T = Temperature of the gas = 25^oC=[25+273]K=298K

R = Gas constant = 62.3637\text{ L.torr }mol^{-1}K^{-1}

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Putting values in above equation, we get:

732.22 torr\times 0.255L=n\times 62.3637\text{ L.torr }mol^{-1}K^{-1}\times 298K\\\\n=\frac{732.22\times 0.255}{62.3637\times 298}=0.01mol

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1 mole of hydrogen gas is produced when 1 mole of the metal is reacted.

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0.01 mole of hydrogen gas is produced when 0.01 mole of the metal is reacted.

Moles of the metal = 0.01 mol

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moles = \frac{Mass\ taken}{Molar\ mass}

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0.01\ mole= \frac{0.590\ g}{Molar\ mass}

Molar mass of the metal = 59.0 g/mol

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3 years ago
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