A single grain of sand occupies a volume of about 0.004 cubic millimeters. Based on your previous answer,

how many grains of sand are on Earth's beaches?

2 & 23

Explanation:

Calculate the number of grains in two steps.

First, calculate the volume of one grain of sand in cubic meters:

0.0044 mm3 ×  = .

Then, calculate the number of grains of sand on the beaches:

7 × 1011 m3 ×  = 2 × 1023 grains.

i can ! i just need to know what the paragraph is! : p

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.