NaCl has a [tex]$\Delta H_{\text {fus }}=30.2 kJ / mol$[/tex]. What is the mass of a sample of NaCl that needs 732.6 kJ of heat to melt completely? Use [tex]$q=n \Delta H$[/tex].
Answer (3)
A virus doesn't do real metabolism, but uses the host cell. The correct answer is D.
D ;
The most likely reason that viruses released into the air survive for only short periods is that they are dependent on host cells of living organisms to replicate. Without access to these cells, viruses cannot sustain themselves outside a living environment. Therefore, the correct answer is D. Viruses are dependent on host cells of living organisms.
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