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vivado [14]
3 years ago
15

Which plant has a shorter orbit. Earth or Mars​

Chemistry
2 answers:
Jet001 [13]3 years ago
7 0

Answer:

Earth

Explanation:

BRAINLIEST PLZ

Verizon [17]3 years ago
6 0

Answer:

Earth has a shorter orbit.

Explanation:

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Answer:

0.116 grams

We can use King Henry Died Unusually Drinking Chocolate Milk

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2 years ago
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What is the balanced equation for naphthalene and sulphur?​
Marianna [84]

napthalene: C10H8 sulphur: S02

Explanation:

C10H8

7 0
3 years ago
The amount of energy available to do work after a chemical reaction has occurred is called
sveticcg [70]
Free energy is the answer i hope this helped
8 0
3 years ago
A buffer is prepared by adding 139 mL of 0.39 M NH3 to 169 mL of 0.19 M NH4NO3. What is the pH of the final solution? (Assume th
Paha777 [63]

Answer:

pH = 9.48

Explanation:

We have first to realize that NH₃ is a weak base:

NH₃ + H₂O ⇔ NH₄⁺ + OH⁻     Kb = 1.8 x 10⁻⁵

and we are adding this weak base to a solution of NH₄NO₃ which being a salt dissociates 100 % in water.

Effectively what we have here is a buffer of a weak base and its conjugate acid. Therefore, we need the Henderson-Hasselbach formula for weak bases given by:

pOH = pKb + log ( [ conjugate acid ] / [  weak base ]

mol NH₃ = 0.139 L x 0.39 M = 0.054 mol

mol NH₄⁺ = 0.169 L x 0.19 M = 0.032 mol

Now we have all the information required to calculate the pOH ( Note that we dont have to calculate the concentrations since in the formula they are a ratio and the volume will cancel out)

pOH = -log(1.8 x 10⁻⁵) + log ( 0.032/0.054) = 4.52

pOH + pH = 14 ⇒ pH = 14 - 4.52 = 9.48

The solution is basic which agrees  with NH₃ being  a weak base.

5 0
3 years ago
What is the number of protons and electrons in a neutral atom of<br> Lithium?
nadya68 [22]
If you look at the periodic table you will see the atomic number (the smaller number) which is 3. that identifies how many protons there are. since the lithium is neutral that means there’s a same amount of electrons.

therefore there’s 3 electrons and 3 protons

3 0
3 years ago
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