(10 points)
use the periodic table to determine how many atoms of phosphorus (p) are in a sample that has a mass of 172.90 g.

a. 3.48 × 1021 atoms

b. 1.97 × 1022 atoms

c. 3.36 × 1024 atoms

d. 1.04 × 1026 atoms

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?

Connect the whole numbers on the periodic table to indicate what they represent?

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.