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gtnhenbr [62]
3 years ago
10

Which one is the largest and which one is the smallest

Chemistry
1 answer:
vlabodo [156]3 years ago
3 0

I think the easiest way to approach this at first if you don't really work with scientific notation a lot is to convert first

so the options would look like this

A 5/.01

B 6.0/1000

C 2.4/1000000

D .31

largest to smallest A, D, B, C

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A chemist must prepare 400 mL of 1.00M aqueous aluminum sulfate working solution. He'll do this by pouring out 1.82 mol/L aqueou
Digiron [165]

Answer:

219.78 mL of the stock solution are needed

Explanation:

First, we take a look at the desired Al2(SO4)3 working solution. We are told that the we need 400 mL of an aqueous aluminum sulfate solution 1.0 M. Let's see how many moles of the compound we have in the desired volume:

1000 mL Al2(SO4)3 solution ----- 1 mole of Al2(SO4)3

400 mL Al2(SO4)3 solution ----- x = 0.4 moles of Al2(SO4)3

To reach the desired concentration in the working solution we need 0.4 moles of Al2(SO4)3 in 400 mL, so we calculate the volume of the stock solution needed to prepare the working solution:

1.82 moles Al2(SO4)3/L = 1.82 M → This is the molar concentration of the stock solution.

1.82 moles of Al2(SO4)3 ----- 1000 mL

0.4 moles of Al2(SO4)3 ----- x = 219.78 mL

So, if we take 219.78 mL of the 1.82 M stock solution, we put it in a graduated cylinder and we dilute it to 400 mL, we would obtain a 1.0 M Al2(SO4)3 solution.

4 0
3 years ago
Read 2 more answers
How do you separate a mixture of sodium chloride and potassium trioxonitrateV<br>​
andre [41]

Answer:

See explanation

Explanation:

We separate substances based on their important properties such as reaction to heat, solubility in water, magnetic properties, etc.

To separate sodium chloride and potassium trioxonitrateV, we need to heat the solution. KNO3 dissolves at a high temperature and crystallizes out as the solution is cooled.

Hence when we heat the solution, KNO3 dissolves, as we cool the solution, solid KNO3 crystals are obtained while NaCl remains in solution.  We have now separated the two salts in the solution.

Note that the solubility of NaCl is almost independent of temperature.

8 0
3 years ago
What is the pH of water?
melamori03 [73]

Answer:

7.00

Explanation:

Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7

8 0
3 years ago
Please help last assignment of the day
Andrej [43]

In this qn, you use the mole formula,

amount (mol) = mass (g) ÷ molar mass

(molar mass is the mass number of an element, which u can find by referring to the periodic table)

so by subbing in the values given to you, you can find the answer

5. amount of Cu = 55.9 ÷ 63.5 = 0.880mol (3sf)

6. amount of N2 = 340 ÷ 2(14.0) = 12.1mol (3sf)

(note: you multiply the molar mass of N by 2 as there are 2 N atoms)

for qn 7 and 8, youre finding the mass and not the amount. By bringing the molar mass over to the other side of the formula, you get

mass = amount (mol) × molar mass

thus,

7. mass of Fe = 0.063 × 55.8 = 3.52g (3sf)

8. mass of H2 = 94.7 × 2(1.0) = 47.4g (3sf)

extra things to take note of:

- likewise, you can also find the molar mass of an element by using

molar mass = mass(g) ÷ amount(mol)

^^ this is commonly only needed when you need to find the molar mass of an isotope. the question will give you the amount and mass of the element, and you just need to factor them in to find your answer.

- typically, you use 3 sf in your final answer and 5sf in your working. remember to write (3sf) at the end of your number statement when necessary.

- when you get an answer of (eg.) 0.6mol, you still need to write it in 3sf, so your answer would be 0.600mol

3 0
3 years ago
Which elements properties form the basis for all life
STatiana [176]

Answer:The properties of carbon forms the basis for all life. Explanation: The atoms of carbon are found in the molecules of all living species.Apr 8, 2018

7 0
3 years ago
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