Find the mass by looking at the measurement! PLS I NEED HELP ASAPP LOOK AT THE PIC AND BE ACCURATE!!

What’s the scientific notation for the number 6,840,000,000

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.

What energy is it when you flip on a switch on a lamp