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Jobisdone [24]
3 years ago
5

What would be the resulting molarity of a solution made by dissolving 17.8 grams of LiF in enough water to make a 915-milliliter

solution? Show all of the work needed to solve this problem.
Chemistry
1 answer:
wariber [46]3 years ago
3 0
First, determine the amount of substance in moles by dividing the given amount in grams by the molar mass. 
              17.8 grams LiF x (1 mole / 25.94 grams LiF) = 0.686 moles LiF
Divide this amount of substance by the volume of the solution in liters.
                           molarity = 0.686 moles LiF / 0.915 L sol'n
The molarity is therefore, 0.75 M. 
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How many liters of space will 7.80 moles of methane gas (CH4) occupy at STP
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Answer:

V CH4(g) = 190.6 L

Explanation:

assuming ideal gas:

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∴ STP: T =298 K and P = 1 atm

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∴ moles (n) = 7.80 mol CH4(g)

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3 years ago
A 53. 5 mL ample of an 5. 4 % (m / v) KBr olution i diluted with water o that the final volume i 205. 0 mL Expre your anwer to t
gogolik [260]

The concentration after dilution is 1.4%.

We are aware that concentration and volume are related to each other by the formula -

C_{1} V_{1} = C_{2} V_{2}, where we have initial concentration and volume on Left Hand Side and final concentration and volume on Right Hand Side.

Keep the values to calculate final concentration.

C_{2} = (53.5 × 5.4)/205.0

Performing multiplication on Right and Side

C_{2} = 288.9/205.0

Performing division on Right Hand Side

C_{2} = 1.4%

Hence, the final concentration is 1.4%.

Learn more about concentration -

brainly.com/question/17206790

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The complete question is -

A 53.5 mL sample of an 5.4 % (m/v) KBr solution is diluted with water so that the final volume is 205.0 mL.

Calculate the final concentration and express your answer to two significant figures and include the appropriate units.

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1 year ago
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A 70.-kg person exposed to ⁹⁰Sr absorbs 6.0X10⁵ β⁻ particles, each with an energy of 8.74X10⁻¹⁴ J.

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7 0
1 year ago
Which technology has helped improve scientists’ ability to gather scientific data about the movement of sea turtles? satellite t
bekas [8.4K]

Answer:either satellite tracking or probware.

Explanation:probate. Think its satalite tracking hope this helps.

8 0
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