To go to mass to number of particles, these are the steps:
Mass divided by molar mass gives moles
moles x avogadros number [will be using 6.02x10^23] gives number of particles.
So:
1.72/128.17 = 0.0134 moles.
0.0134 x 6.02x10^23= 8.07xx10^21 molecules of naphthalene. [rounded to 3 significant figures]
The total amount of energy remains the same in a closed system
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Metal have some properties like lustrous (shiny), good conductors of electricity and heat,etc. Metals have another property by which metal can be drawn into a wire by hammering on it .This property is called as 'ductility'.
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Answer:
There are no products.
Explanation:
A possible reaction could be the double displacement reaction
2NaI(aq) + CaCl₂ ⟶ 2NaCl(aq) + CaI₂(aq)
However, there is no reaction because the halide salts of Group 1 and Group 2 metals are soluble.