24-05-2014
Chemistry

contestada

How many atoms are there in 90.2 grams of selenium?

Respuesta :

Sabrina211 Sabrina211

25-05-2014

First calculate the moles of selenium by multiplying the mass x molar mass
90.2 × 78.96 = 7122.2 moles

Number of moles multiplied by avogadros number gives number of atoms
7122.2 × 6.022 × 10^{23} = 4.289×10^{27} atoms

Answer Link

Otras preguntas

which 2 of the following were British documents that influenced the creation of the US constitution

5x + 3y = -2 3x + 2y = -1 Solve the system of equations. A) (-1, 1) B) (1, -1) C) (-1, -2) D) ( 1 3 , 1)

i need to answer and explain

When i look back on the decisions i've made, it's clear that i made some of my best choices not through a thorough analytical investigation of my options, but i

Which method of selecting a president did many of the farmers initially favor?

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! When a light wave reflects off a mirror, it must obey the law of reflection. If the angle of incidence is 22 d

wendy can ride her bike 0.8 miles in 6 minutes how many miles can she ride her bike in 2.5 hours

A 5-ounce can of tuna costs $0.90. A 12-ounce can of tuna costs $2.40. Which is the better buy?

What disappears entirely in the deep ocean

Plz help I really need it and fast