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3 years ago

The prefix milli- means 103 10-2 10-3 102

1 answer:

3 0

Milli- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3). Proposed in 1793 and adopted in 1795, the prefix comes from the Latin mille, meaning "one thousand" (the Latin plural is milia).

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Which of the following chemical symbols represents the element silver?

notsponge [240]

Silver is Ag from the latin Argentum

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3 years ago

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What are the raw materials/reactants and products of photosynthesis

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Carbon Dioxide + Oxygen Gas + Water + Sunlight Yields Glucose + Oxygen

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3 years ago

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 38.5 g of the non-volatile non-electrolye u

Free_Kalibri [48]

Answer: The vapor pressure of methanol solution at 298K is 107.12 torr

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

$\frac{p^o-p_s}{p^o}=i\times x_2$

where,

$\frac{p^o-p_s}{p^o}$ = relative lowering in vapor pressure

i = Van'T Hoff factor = 1 (for non electrolytes)

$x_2$ = mole fraction of solute = $\frac{\text {moles of solute}}{\text {total moles}}$

Given : 38.5 g of urea is present in 142 g of methanol

moles of solute (urea) = $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{38.5g}{60g/mol}=0.64moles$

moles of solvent (methanol) = $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{142g}{32g/mol}=4.4moles$

Total moles = moles of solute + moles of solvent = 0.64 + 4.4 = 5.04

$x_2$ = mole fraction of solute = $\frac{0.64}{5.04}=0.127$

$\frac{122.7-p_s}{122.7}=1\times 0.127$

$p_s=107.12torr$

Thus the vapor pressure of methanol solution at 298K is 107.12 torr

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3 years ago

Pitchblende is ore of _____.

Valentin [98]

Its an ore of uraninte i think.

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4 years ago

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If I have 7.0 x 10^24 formula units of magnesium chloride, how many grams of chlorine would I have?

REY [17]

Answer:

824 g

Explanation:

First we convert 7.0 x 10²⁴ formula units of magnesium chloride (MgCl₂) into moles, using Avogadro's number:

7.0 x 10²⁴ formula units ÷ 6.023x10²³ formula units/mol = 11.62 mol MgCl₂

There are two Cl moles per MgCl₂ moles, meaning that we have (2 * 11.62) 23.24 moles of Cl

Finally we convert 23.24 moles of chlorine into grams, using chlorine's molar mass:

23.24 mol * 35.45 g/mol = 824 g

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3 years ago