f 70.50 mL of HCL stock solution is used to make 450 mL of 0.675 M HCl dilution, what is the molarity of the stock solution?

Idon’t know how to solve this question

What type of electromagnetic radiation has a shorter wavelength than blue light

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?