The ice sculpture would take longer to melt than the ice cube
In a chemical equation coefficients indicate the number of molecules/atoms involved in the reaction.
<em>i think the answer is b </em>
A covalent bond? Not sure how much detail you want, sorry
Answer:
b) 2.0 mol
Explanation:
Given data:
Number of moles of Ca needed = ?
Number of moles of water present = 4.0 mol
Solution:
Chemical equation:
Ca + 2H₂O → Ca(OH)₂ + H₂
now we will compare the moles of Ca and H₂O .
H₂O : Ca
2 : 1
4.0 : 1/2×4.0 = 2.0 mol
Thus, 2 moles of Ca are needed.
