I think it’s b
Heat isn’t transferred by sublimation
Answer:
17.3 g Cr
Explanation:
To find the mass of chromium, you need to (1) convert moles Si to moles Cr (using the mole-to-mole ratio from equation coefficients) and then (2) convert moles Cr to grams Cr (using the atomic mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (0.250).
3 Si + 2 Cr₂O₃ ---> 4 Cr + 3 SiO₂
^ ^
Atomic Mass (Cr): 51.996 g/mol
0.250 moles Si 4 moles Cr 51.996 g
------------------------- x -------------------- x ------------------- = 17.3 g Cr
3 moles Si 1 mole
Explanation:
Membrane is a barrier that separates two phases and that totally or partially restricts the transport of one or more chemical species present in the phases. The membrane separation method is based on the use of chemical potential and/or electrical potential gradient as the driving force for the separation. The membrane separation unit operation is based on the use of chemical potential and/or electrical potential gradient as the driving force for the separation.
Given that chemical potential is a function of pressure, temperature and concentration, and that membrane separation processes are generally operated at a constant temperature, both concentration gradients and pressure gradients can act as driving forces capable of promoting the transport of a given species across the membrane.
Examples of processes where the driving force is the pressure gradient are: Microfiltration, Nanofiltration, and Reverse Osmosis. Processes where the driving force are the concentration gradient: gas permeation, dialysis. Processes whose driving force is the electric potential gradient: electrodialysis.
Answer: The atomic weight of any atom can be found by multiplying the abundance of an isotope of an element by the atomic mass of the element and then adding the results together. This equation can be used with elements with two or more isotopes: Carbon-12: 0.9889 x 12.0000 = 11.8668. Carbon-13: 0.0111 x 13.0034 = 0.1443.
Explanation: