Which of the following quantities is INCORRECTLY matched with its SI base unit? SI Base Units
Quantity
Base Unit
Time
second(s)
Length
Mass
Temperature
Amount of a
substance
meter (m)
kilogram (kg
kelvin (K)
mole (mol)
Electric current
ampere (A)
candela (cd)
Luminous
intensity
O A. Mass kilogram
O B. Temperature / °C
C. Electric current ampere
D. Time second

answer: mercury

explanation:

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

b.

the accuracy of the data.