The atomic mass of carbon is 12.011 g/mol. how many atoms of carbon have that exact mass? why?

An Avogadro's number (6.022 x 10^23) worth of carbon atoms have that exact mass.

12.011 is the MOLAR mass of carbon. It is the mass of 1 mole of carbon. 1 mole of anything contains 6.022 x 10^23 of that thing.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.