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Answer:
Balanced equation is: 2Na (s) + Cl₂(g) → 2NaCl (s)
Number of moles of needed Cl₂ → 0.217 moles
Mass of needed Cl₂ → 15.4 g
Explanation:
We determine the reaction
2Na (s) + Cl₂(g) → 2NaCl (s)
We convert the mass of solid Na to moles
10 g. 1 mol/23 g = 0.435 moles
Ratio is 2:1. 2 moles of Na react with 1 mol of chlorine
Then, 0.435 moles of Na may react with (0.435 . 1)/2 = 0.217 moles of Cl₂
Number of moles of needed Cl₂ → 0.217 moles
We convert the moles to mass → 0.217 mol . 70.9 g/1mol = 15.4 g
Answer:
Commonly available heat-storage materials cannot usually store the energy for a prolonged period. If a solid material could conserve the accumulated thermal energy, then its heat-storage application potential is considerably widened. Here we report a phase transition material that can conserve the latent heat energy in a wide temperature range, T<530 K and release the heat energy on the application of pressure. This material is stripe-type lambda-trititanium pentoxide, λ-Ti3O5, which exhibits a solid–solid phase transition to beta-trititanium pentoxide, β-Ti3O5. The pressure for conversion is extremely small, only 600 bar (60 MPa) at ambient temperature, and the accumulated heat energy is surprisingly large (230 kJ L−1). Conversely, the pressure-produced beta-trititanium pentoxide transforms to lambda-trititanium pentoxide by heat, light or electric current. That is, the present system exhibits pressure-and-heat, pressure-and-light and pressure-and-current reversible phase transitions. The material may be useful for heat storage, as well as in sensor and switching memory device applications.
Explanation: