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s344n2d4d5 [400]
4 years ago
14

Name the 5 most important elements in living organisms.

Chemistry
1 answer:
jok3333 [9.3K]4 years ago
6 0
Carbon
Hydrogen
Nitrogen
Sulfur
Phosphorus
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. In lab we used 40 ml of 6M NaOH in making soap.<br>How many moles of NaOH was in this volume?​
Firdavs [7]

Hey there!:

Molarity of NaOH = 6 M or 6 mol/L

Volume of NaOH = 40 mL

Therefore , number of moles of NaOH:

40 mL  =( 6 mol / 1000 mL)*40=

6/ 1000 * 40 =>  0.24 moles of NaOH

Hope this helps!

8 0
3 years ago
A small pebble breaks off of a huge boulder. Th e pebble has the same density
AURORKA [14]

Answer:  Hmmmm.   Let's see...

Explanation:  A pebble has the same density and a boulder when it rolls down a hill.  The pebble will most-likely roll down very fast which can make it dense.

<h2 /><h2>I really hope this helped! like at all...</h2><h2>Truthfully, I don't know a lot of this type of stuff.. But worth a shot, right?</h2>

8 0
3 years ago
Read 2 more answers
What type of reaction occurs when energy is released?​
Charra [1.4K]
Exothermic is a chemical reaction that releases energy.
5 0
3 years ago
How does the number of reactants in a decomposition reaction compare with
dem82 [27]
Answer is B the number of reactants is the same as the number of products
6 0
3 years ago
3 Mg + 1 Fe2O3 --&gt; 2 Fe + 3 MgO
Gala2k [10]

Answer:

Fe₂O₃ is the limiting reactant.

7.57 g of MgO are formed.

Explanation:

  • 3 Mg + 1 Fe₂O₃ → 2 Fe + 3 MgO

First we <u>convert the given masses of both reactants into moles</u>, using their <em>respective molar masses</em>:

  • 15.6 g Mg ÷ 24.305 g/mol = 0.642 mol Mg
  • 10.0 g Fe₂O₃ ÷ 159.69 g/mol = 0.0626 mol Fe₂O₃

0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, <em>Fe₂O₃ is the limiting reactant</em>.

We now <u>calculate how many MgO moles are produced</u>, using the <em>number of moles of the limiting reactant</em>:

  • 0.0626 mol Fe₂O₃ * \frac{3molMgO}{1molFe_2O_3} = 0.188 mol MgO

Finally we <u>convert moles of MgO into grams</u>:

  • 0.188 mol MgO * 40.3 g/mol = 7.57 g
8 0
3 years ago
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