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Kobotan [32]
3 years ago
12

A large weather balloon filled with helium has a volume of 7.00 x 102 L at STP. Which expression should be used to find the mass

of helium in the balloon?
Chemistry
1 answer:
balandron [24]3 years ago
7 0

Answer:

mass of Helium = mole of Helium x Molarmass of Helium

Explanation:

Mole of Helium = volume of Helium/ 22.4dm^3/mol

                          = 7.00 x 10^2/22.4

                          = 31.25mol

Mass of Helium = mole of Helium x Molarmass of Helium

                           = 31.25mol x 4g/mol

                           = 125g

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1 mole of nacl(s) has a greater entropy than 1 mole of nacl(aq). true or false g
Svetradugi [14.3K]
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3 0
3 years ago
Consider the reaction <img src="https://tex.z-dn.net/?f=N_2%20%2B%203%20H_2%20%5Crightarrow%202%20NH_3" id="TexFormula1" title="
sammy [17]

Answer: E

How much NH₃ can be produced from the reaction below:

N₂ + 3H₂ - 2NH₃

The stoichiometric ratio of the reactants = 1:3

Given

74.2g of N₂, and Molar mass = 14g/mole

Mole of N₂ = 74.2/14=5.3mols of N₂,

and 14mols of H₂

From this given values and comparing with the stoichiometric ratio, H₂ will be the limiting reagent while N₂ is the excess reactant.  

i.e, for every 14mols of H₂, we need 4.67mols of N₂ to react with it to produce 9.33mols of NH₃ as shown (vice versa)

From this we have 9.33mols of NH₃ produced

Avogadro constant, we have n = no of particles = 6.022x10²³ molecules contained in every mole of an element.

For a 9.33mols of NH3, we have 9.33x6.022x10²³molecules in NH3

5.62x10²⁴molecules of NH₃

6 0
3 years ago
Which are Lewis acids and which are Lewis bases?(a) Mg²⁺(b) OH⁻(c) SiF₄(d) BeCl₂
GrogVix [38]

OH⁻, BeCl₂ and SiF₄ are Lewis acids whereas, Mg²⁺ is a Lewis base.

<h3>What is a Lewis acid-base reaction?</h3>
  • According to the Lewis theory of acid-base reactions, acids accept pairs of electrons and bases donate pairs of electrons.
  • Any substance like H+ ion, which is capable of accepting a pair of nonbonding electrons or an electron-pair acceptor is known as a Lewis acid.
  • Any substance, like the OH- ion, that is capable of donating a pair of nonbonding electrons or an electron-pair donor is a Lewis base.
  • Here OH⁻, BeCl₂ and SiF₄ are electron deficient whereas, Mg²⁺ donates the electrons to other species present in the reaction.
  • From the Lewis theory, with no change in the oxidation numbers of any atoms, acids react with bases to share a pair of electrons.

To learn more about Lewis acid-base reactions: brainly.com/question/14861040  

#SPJ4                                                                                              

5 0
1 year ago
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