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Examen de quimica. 1º bach.
1. Cuando se queman 3,2g de azufre, se consumen 3,2g de oxígeno y se forma dióxido de azufre. ¿Cuántos gramos de este producto se formará? ¿Qué ley se aplica para hacer el cálculo anterior?
2. Un ácido está formado por un 54,53% de C, un 9,15% de H y un 36,32% de O. Su masa molecular es igual a 88 uma. Calcular su fórmula.
3. 3,70 moles de CH4 pesan _______ y contienen ________ moléculas, ___________ átomos de hidrógeno y _______ átomos de carbono.
4. En 0,750 litros de una disolución 0,500M, hay _______ moles de soluto. Si se añade suficiente disolvente para llevar el volumen de la disolución a 1 litro habrá _______ moles de soluto. En la nueva disolución la concentración es __________M.
5. Un químico ha sintetizado un compuesto gaseoso verde-amarillo de cloro y oxígeno y encuentra que su densidad es 7,71g/l a 36ºC y 2,88atm. Calcúlese la masa molecular del compuesto.
6. Una disolución de ácido nítrico (NHO3) concentrado contiene 68,1% en peso de dicho ácido y su densidad es de 1,405g/cm3. Calcúlense:
a) las fracciones molares del ácido y del agua en la disolución
b) la molaridad y la molalidad del ácido
c) la normalidad del ácido en la disolución
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Enviado por: Lucía Idioma: castellanoPaís: España