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Dvinal [7]
3 years ago
15

Which of the following elements has the largest atomic size? S, Ba, Po, Ca​

Chemistry
2 answers:
prohojiy [21]3 years ago
7 0

Answer:

Ba has the largest atom size

AVprozaik [17]3 years ago
4 0
The size of the largest size is BA
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A 45ml of a 4M solution of CaBr2 contains how many grams of CaBr2?
natta225 [31]

The required mass of calcium bromide is 35.98 grams.

<h3>What is molarity?</h3>

Molarity is any solution is define as the number of moles of solute present in per liter of solution as;

M = n/V, where

  • M = molarity = 4M
  • V = volume = 45mL = 0.045L

Moles will be calculated by using the above equation as:

n = (4)(0.045) = 0.18 mole

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

  • W = given mass
  • M = molar mass

Mass of CaBr₂ = (0.18mol)(199.89g/mol) = 35.98g

Hence required mass of CaBr₂ is 35.98 grams.

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Balance the following reaction. P4 + 3 O2 → 2P2O5
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The decomposition reaction 2 NOCl → 2 NO + Cl_2 has a rate law that is second order with respect to ​[NOCl], where k = 3.2 M^{-1
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Answer:

It will take 3.3 s for [NOCl] to decrease to 0.042 M.

Explanation:

Integrated rate law for this second order reaction-

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where, [NOCl] is concentration of NOCl after "t" time, [NOCl]_{0} is initial concentration of NOCl and k is rate constant.

Here, [NOCl]_{0} = 0.076 M, k = 3.2 M^{-1}s^{-1} and [NOCl] = 0.042 M

So, \frac{1}{0.042M}=[3.2M^{-1}s^{-1}\times t]+\frac{1}{0.076M}

or, t = 3.3 s

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