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Akimi4 [234]
2 years ago
12

Which of the following makes its own food using energy from the sun? *

Chemistry
1 answer:
Maksim231197 [3]2 years ago
5 0

Answer:

all

Explanation:

because they are all plants

or maybe green algae

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I need help with this because it's easy for you guys but I don't understand it
WARRIOR [948]

Answer:

from nitrogen fixation in plants, lightning and bacteria

Explanation:

3 0
3 years ago
A 15.00-ml sample of a naoh solution of unknown concentration requires 17.88 ml of a 0.1053 m h2so4 solution to reach the equiva
Sergeu [11.5K]

Answer:

  • <u>0.1255 M</u>

Explanation:

<u>1) Data:</u>

Base: NaOH

Vb = 15.00 ml = 15.00 / 1,000 liter

Mb = ?

Acid: H₂SO₄

Va = 17.88 ml = 17.88 / 1,000 liter

Ma = 0.1053

<u>2) Chemical reaction:</u>

The <em>titration</em> is an acid-base (neutralization) reaction to yield a salt and water:

  • Acid + Base → Salt + Water

  • H₂SO₄ (aq) + NaOH(aq) → Na₂SO₄ (aq) + H₂O (l)

<u>3) Balanced chemical equation:</u>

  • H₂SO₄ (aq) + 2 NaOH(aq) → Na₂SO₄ (aq) + 2H₂O (l)

Placing coefficient 2 in front of NaOH and H₂O balances the equation

<u>4) Stoichiometric mole ratio:</u>

The coefficients of the balanced chemical equation show that 1 mole of H₂SO₄ react with 2 moles of NaOH. Hence, the mole ratio is:

  • 1 mole H₂SO₄ : 2 mole NaOH

<u>5) Calculations:</u>

a) Molarity formula: M = n / V (in liter)

   ⇒ n = M × V

b) Nunber of moles of acid:

  • nₐ = Ma × Va = 0.1053 (17.88 / 1,000)

c) Number of moles of base, nb:

  • nb = Mb × Vb = Mb × (15.00 / 1,000)

d) At equivalence point number of moles of acid = number of moles of base

  • nₐ = nb

  • 0.1053 × (17.88 / 1,000) =  Mb × (15.00 / 1,000)

  • Mb = 0.1053 × 17.88  / 15.00 = 0.1255 mole/liter = 0.1255 M
3 0
3 years ago
Read 2 more answers
Help me please!!!!!!!!
ale4655 [162]

Answer:

that's a hard one

Explanation:

6 0
3 years ago
Read 2 more answers
If you take a 15.0-mL portion of the stock solution and dilute it to a total volume of 0.600 L , what will be the concentration
alexira [117]

15 \div .6
6 0
3 years ago
What would you need to do to calculate the molality of 10 mol of NaCl in 200
Makovka662 [10]
It will be the second one
8 0
3 years ago
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