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Diano4ka-milaya [45]
3 years ago
8

Mary wanted to determine which type of fertilizer would help her plants grow taller. She got 16 plant pots andd scooped 2 cups o

f the same type of soil in each. Then she planted 1 sunflower seed in each plant pot. The first four pots were placed in her garden to grow. No fertilizer was added to this group. Mary did this to see how tall sunflower plants would grow under normal conditions. In the next four pots she added Miracle Grow. In the four pots she added Grow Rite and the last four pots she added Perlite. She placed all the plant pots in the same are of the garden.
How many trials were conducted?
Chemistry
1 answer:
Natali5045456 [20]3 years ago
3 0

Mary conducted four trials:

1. One with no fertilizer

2. One with Miracle Grow

3. One with Grow Rite

4. One with Perlite

She used four pots per trial, for a total of 16 pots.

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A 251 ml sample of 0.45M HCl is added to 455 mL of distilled water. What is the molarity of the
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<u>We are given:</u>

251 mL sample of 0.45M HCl added to 455 mL distilled water

<u>Whack a mole! (finding the number of moles):</u>

We know that in order to find molarity, we use the formula:

Molarity = number of moles / Volume (in L)

so, number of moles is:

Number of moles = Molarity * Volume(in L)

now let's plug the values for the HCl solution to find the number of moles

Number of moles = 0.45M * 0.251 L

Number of moles = 0.113 moles

<u>Time to concentrate (finding the final concentration):</u>

Total final volume = 251 mL + 455 mL = 706 mL = 0.706 L

Number of moles of HCl = 0.113 moles

Molarity = Number of moles / Volume (in L)

Molarity = 0.113 / 0.706

Molarity = 0.16 M

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<u>BONUS METHOD TIME!!!</u>

We know the relation:

M1 * V1 = M2 * V2

where M1 and M2 are the initial and final molarities and V1 and V2 are initial and final volumes respectively

notice that I didn't mention that the volume has to be in Liters, that's because of the units being concerned with both sides of the equation, say I have the volume in mL and want to convert both these volumes to L, I would divide both sides by 1000, which would NOT change the overall value

Now, plugging values in this equation

(0.45) * (251) = (251 + 455)* (M2)

112.95 = (706)(M2)

M2 = 112.97/706                                [dividing both sides by 706]

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Answer:

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