<span>Abundance of each isotope = 0.1900 x100 = 0.001900
</span><span>0.2500 = 0.002500
</span><span>88.43 = 0.8843
</span>11.13 = 0.1113
Atomic mass of the element = (<span>135.90714 x 0.001900</span>) + (<span>137.90599 x 0.002500</span>) + (<span>139.90543 x 0.8843</span>) + (<span>141.90924 x 0.1113</span>)
= 0.258223566 + 0.344764975 + 123.718371749 + 15.794498412
= 140.1 amu is the atomic mass of the element
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I believe the answer is A. <span />
The chemical equation for the reaction is 
<h3>Chemical reaction</h3>
Chromium metal is higher in the reactivity series than cobalt. Thus, chromium will displace cobalt from solutions.
Therefore, the equation for the reaction between chromium metal and cobalt (II) chloride will be written as:
More on chemical reactions can be found here: brainly.com/question/22817140
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<em>Chromium metal is immersed in an aqueous solution of cobalt(II) chloride. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter no reaction if no reaction occurs.</em>
The molarity of a substance is the number of moles of the substance present per liter. We are given the mass per liter, which is 292 grams. We may convert this into moles by dividing by the molecular mass of magnesium nitrate. This is:
Mg + 2 * NO₃⁻
24 + 2 * (14 + 16*3)
Mr = 148 g/mol
The molarity of the solution is:
M = 292/148 = 1.97 moles / liter
The solution has a molarity of 1.97 M
