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tensa zangetsu [6.8K]
3 years ago
10

The element aluminum has an atomic number of 13.

Chemistry
1 answer:
Umnica [9.8K]3 years ago
5 0

Answer:

Aluminum has (by definition) 13 protons, 13 positively charged particles. Because aluminum is neutral (as is all matter), it therefore has 13 negatively charged particles, electrons

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How many grams of NaC2H3O2 are needed to prepare 350. mL of a 2.75 M solution? (molar mass of
shepuryov [24]

Answer:

78.96 g of NaC2H3O2

Explanation:

We are given;

  • Volume of the solution as 350 mL
  • Molarity of the solution as 2.75 M
  • Molar mass of the solute NaC2H3O2 as 82.04 g/mol

We are required to determine the mass of the solute;

First we determine the number of moles;

Moles = Molarity × Volume

Therefore;

Moles of the solute = 2.75 M × 0.350 L

                                = 0.9625 moles

Second, we determine the mass

Mass = Moles × Molar mass

        = 0.9625 moles × 82.04 g/mol

        = 78.9635 g

        = 78.96 g

Therefore, the mass of NaC2H3O2 needed is 78.96 g

4 0
3 years ago
A pressure of 745 mm hg equals select one:
Flura [38]
As we know that,

                                        1 mm Hg  =  1 torr
So,
                                    745 mm Hg  =  X

                         X  =  (745 mm Hg × 1 torr) ÷ 1 mm Hg

                         X  =  745 torr

Also,
                                    1 mm Hg  =  133.325 Pa
So,
                                    745 mm Hg  =  X

                         X  =  (745 mm Hg × 133.325 Pa) ÷ 1 mm Hg

                         X  =  99327 Pa

Result:
          Option-A (745 torr) is the correct answer.
3 0
3 years ago
What volume in liters, l, of solution should sven prepare if he wants to make a 5.00 m solution using 210.0 grams, g, of sodium
weeeeeb [17]

To make a 5.00 M solution using 210.0 grams, g, of sodium chloride, NaCl, we will use the formula of volume of solution in liters is equal to mole of solute per molarity of solution, which is 0.718 L.

Molarity (M) refers to the amount of a substance in a specific volume of solution. It is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.

Molarity  is given by the quotient,

Molarity = moles of solute/volume of solution in liters.

Now in order to get the molarity of the solution, we have to divide the moles of solute over the liters of solution. Since we are given the mass of the solute, we must first convert the mass of NaCl into moles with the help of the molar mass of NaCl as a conversion factor.

210 NaCl x ( 1 mol NaCl/ 58.44g NaCl) = 3.59 mol NaCl.

We already have the molarity of the solution that is 5.00 M. So the solution to find out the volume will be,

Volume of solution in liters = mole of solute/ molarity of solution,

That is 3.59 mol NaCl / 5M = 0.718 L

To learn more about Molarity, head here

brainly.com/question/8732513

#SPJ4

5 0
2 years ago
Which of these molecular geometries forms a molecule with a bent shape?
allsm [11]

Answer:

well plus da cuh cause opp homie freak jit.on 390/it = 30

3 0
2 years ago
Pls help and match them
slega [8]

Answer:

Simile: C

Personification: D

Symbol: A

Hyperbole: B

Metaphor: E

Explanation:

3 0
3 years ago
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