2. Se recoge gas hidrogeno sobre agua a 25°C. El volumen del gas recogido es de 55 ml y la presión es de 758 mmHg. Si el gas estuviera seco y medido en
condiciones normales ¿Cuál sería el volumen? (Pv(Hz) a 25°C = 23.8 mmHg).

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.