PLEASE HELP ONLY ONE QUESTION

A+b→2c when the reaction begins, the researcher records that the rate of reaction is such that 1 mole of a is consumed per minute. after making changes to the reaction, the researcher notes that 2 moles of a are consumed per minute. what change could the researcher have made to effect this change?

How many neutrons does an element have if its atomic number is 50 and its mass number is 166

Which property of water causes water drops to bead on a freshly waxed car?