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Rzqust [24]
3 years ago
8

Calcium forms ions with a charge of +2. Iodine forms ions with a charge of -1. Which of the following would represent an ionic c

ompound composed of Calcium and Iodide ions? Cal2. Cal. Ca2l. Ca2l. 2Cal. Cal2.
Chemistry
2 answers:
Stolb23 [73]3 years ago
7 0
Well you know that you have to balance out the equation to 0. So if I is -1 and Ca is +2 you know that I had to equal to -2. So you can do that by having two of them. So Ca=+2 and I2=-2 so CaI2 would equal 0 meaning that would be the correct answer. Hope that I explained that correct :)
Wittaler [7]3 years ago
5 0
<h2>Answer:</h2>

The option number 1 and 6 are correct answer.

Which is the formula of ionic compound composed of Calcium and Iodide ions is CaI2.

<h3>Explanation:</h3>
  • As we know a balanced ionic compound has net charge zero.
  • So if the calcium ions have +2 charge so there will be 2 ions of iodine charges of -1 making total charge of iodine -2.
  • Hence -2 and +2 will cancel each other making a balanced ionic compound.
  • Which has formula CaI2.
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You have 100 g of Pb(NO3)2. How many moles is this?​
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Answer:

0.302 moles

Explanation:

Data given

Mass of Pb(NO₃)₂ = 100 g

Moles of Pb(NO₃)₂ = ?

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To find mole we have to know about molar mass of Pb(NO₃)₂  

So,

Molar mass of Pb(NO₃)₂  = 207 + 2[14 + 3(16)]

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Molar mass of Pb(NO₃)₂  = 331 g/mol

Formula used :

                no. of moles = mass in grams / molar mass

Put values in above formula

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