Una sustancia A se mezcla en cantidades iguales con otra sustancia B. Admitiendo que al cabo de 1000 segundos la mitad de A haya reaccionado y que luego de 2000 segundos sólo queda 0,25 de la cantidad inicial, determine si el proceso pertenece a una reacción de primer orden calculando su k.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

catya your not at all which answer i've seen you do this on another question!