well from what I know I am pretty sure that it is chemical energy
The age of the mineral is 8.9×10⁹ years.
We'll begin by calculating the rate constant.
Half-life (t½) = 4.5×10⁹ years
Original amount (N₀) = 61.0 mg
Remain remaining (N) = 15.5 mg
Rate constant (K) = 1.54×10¯¹⁰ / year
Therefore, the mineral is 8.9×10⁹ years old.
Learn more: brainly.com/question/25798542
Answer:
0.9852 moles of CaO
Explanation:
Reaction equation for the decomposition of CaCO₃:
CaCO₃ → CaO + CO₂
The question asks how many moles of CaO form when 98.60g of CaCO₃ decompose.
We can see from the reaction equation that for every mol of CaCO₃, one mol of CaO will be produced (molar ratio 1:1)
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So first we need to calculate how many moles are the 98.60g of CaCO₃:
Molar Mass of CaCO₃ = molar mass Ca + molar mass C + 3 * molar mass O
= 40.078 + 12.011 + 3 * 15.999 = 100.086 g/mol
Moles of CaCO₃ = mass CaCO₃ / molar mass CaCO₃
Moles of CaCO₃ = 98.60 g / 100.086 g/mol = 0.9852 moles CaCO₃
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As we said before for every mol of CaCO₃, one mol of CaO is produced.
So the decomposition of 0.9852 moles of CaCO₃ will produce 0.9852 moles of CaO.
Hey I think it is going to be 0986 moles. Cuz we can see that no. of moles of CaCO3 which will decompose is equivalent to the no. of CaO . Now it's just the matter of finding the no. of moles of CaCO3 .
no.of moles=mass /relative molecular mass
i'll seriously mark you brainly.
please help.
Answer:
First box: 3
Second box: 4
Third box: 3
Fourth box: 4
Explanation:
I tried out various numbers, but got 3 and 4 because:
3PbI4 + 4CrCl3 -----> 3PbCl4 + 4CrI3
Each term cancels put.
3Pb --> 3Pb
4Cr --> 4Cr
and so forth...
Hope this helps!