How do you know the mole ratio by the equation- that's all I need to know

What element breaks down into yttrium-90?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.