Answer:
Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. One of the ways that plants can produce offspring is by making seeds.
Explanation:
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Here is the complete question.
Benzalkonium Chloride Solution ------------> 250ml
Make solution such that when 10ml is diluted to a total volume of 1 liter a 1:200 is produced.
Sig: Dilute 10ml to a liter and apply to affected area twice daily
How many milliliters of a 17% benzalkonium chloride stock solution would be needed to prepare a liter of a 1:200 solution of benzalkonium chloride?
(A) 1700 mL
(B) 29.4 mL
(C) 17 mL
(D) 294 mL
Answer:
(B) 29.4 mL
Explanation:
1 L = 1000 mL
1:200 solution implies the
in 200 mL solution.
200 mL of solution = 1g of Benzalkonium chloride
1000 mL will be ![\frac{1000mL}{200mL}=\frac{1g}{xg}](https://tex.z-dn.net/?f=%5Cfrac%7B1000mL%7D%7B200mL%7D%3D%5Cfrac%7B1g%7D%7Bxg%7D)
200mL × 1g = 1000 mL × x(g)
x(g) = ![\frac{200mL*1g}{1000mL}](https://tex.z-dn.net/?f=%5Cfrac%7B200mL%2A1g%7D%7B1000mL%7D)
x(g) = 0.2 g
That is to say, 0.2 g of benzalkonium chloride in 1000mL of diluted solution of 1;200 is also the amount in 10mL of the stock solution to be prepared.
∴ ![\frac{10mL}{250mL}=\frac{0.2g}{y(g)}](https://tex.z-dn.net/?f=%5Cfrac%7B10mL%7D%7B250mL%7D%3D%5Cfrac%7B0.2g%7D%7By%28g%29%7D)
y(g) = ![\frac{250mL*0.2g}{10mL}](https://tex.z-dn.net/?f=%5Cfrac%7B250mL%2A0.2g%7D%7B10mL%7D)
y(g) = 5g of benzalkonium chloride.
Now, at 17%
concentrate contains 17g/100ml:
∴ the number of milliliters of a 17% benzalkonium chloride stock solution that is needed to prepare a liter of a 1:200 solution of benzalkonium chloride will be;
= ![\frac{17g}{5g} = \frac{100mL}{z(mL)}](https://tex.z-dn.net/?f=%5Cfrac%7B17g%7D%7B5g%7D%20%3D%20%5Cfrac%7B100mL%7D%7Bz%28mL%29%7D)
z(mL) = ![\frac{100mL*5g}{17g}](https://tex.z-dn.net/?f=%5Cfrac%7B100mL%2A5g%7D%7B17g%7D)
z(mL) = 29.41176 mL
≅ 29.4 mL
Therefore, there are 29.4 mL of a 17% benzalkonium chloride stock solution that is required to prepare a liter of a 1:200 solution of benzalkonium chloride
Let MM(x) be the molar mass of x.
MM(Pb) : MM(PbO)
=207.21 : 223.20 = 451.4 g : x g
cross multiply and solve for x
x=223.2/207.21*451.4
= 486.23 g
Percentage yield = 365.0/486.23= 0.75067 = 75.07% (rounded to 4 sign. fig.)
Answer:
<h2>Ammonia Gas</h2>
Explanation:
It result in formation of ammonia gas.
N2 + 3H2 ---<u>iron</u><u>/</u><u>molybdenum</u><u>/</u><u>high</u><u> </u>temp/pres--- > 2 NH3
It forms ammonia gas.
Please mark branliest if you are satisfied with the answer. Thanking in anticipation.
No doubt it's B. solid, liquid, and gas.
Hope this helps!