Answer:
Se llaman bioelementos primarios. Los átomos de carbono tienen la capacidad de unirse a otros átomos. Esto permite que tenga lugar la vida y es por eso que el carbono es el bioelemento más importante. Otros elementos químicos se encuentran en los seres vivos; sin embargo, aparecen en pequeñas cantidades.
Explanation:
Try c maybe, i’m not too sure sorry boo xxo
Half life is 15 hours
so 30 hours would be 2 half lives
after 15 hours it would be at 50%
after 15 more hours it would be at 50% of 50%
so .5 x .5 = .25
it would be 25%
Molar mass of CuSO4*5H2O = <span>63.5 + 32 + 4(16) + 5(18) = 249.5 g/mole
molarity is calculated as follows:
molarity = number of moles of solutes/liters of solution
We will assume that the number of liters = 1
Substituting in the above equation:
0.02 = number of moles of CuSO4*5H2O / 1
number of moles = 0.02 moles
number of moles = mass/molar mass
mass = number of moles * molar mass
mass = 0.02 * </span><span>249.5 = 4.99 grams</span>
Answer:
(c) it must be N2 ( Nitrogen gas ) but not N
(h) it must be HNO3 ( Nitric acid ) but not HNO