tiny1400 tiny1400

04-01-2016
Chemistry

contestada

what is the mass of 9.0 x 10^17 molecules of He gas at STP

Respuesta :

Billymkhoi Billymkhoi

04-01-2016

(9.0*10^17 He molecules)* (1 mol He/ (6.02*10^23 He molecules))= 1.5*10^(-6) mol He.

1.5*10^(-6) mol He* (4.00 g He/ 1 mol He)= 6.0*10^(-6) g He.

The mass of 9.0*10^17 He molecules at STP is 6.0*10^(-6) g He~

Answer Link

Otras preguntas

A bank charges $3 each time you use an out of network ATM. at the beginning of the month, you have $1500 in your bank account. you withdrawal $60 from your bank

why do living things need nitrogen?

Lily and julian start with the same number. Lily works out half the number and Julian works out 3 quarters The sum of their answers in 275 What was the startin

There are 21 males in the algebra 1 class. If 75% is female, how many students are there in the class?

why does methane have a low boiling pint?

A shop is giving 20% discount in a sale. A shirt in the shop normally costs $60. How much does it cost in the sale?

why do you use cubic units and not square units to find the volume of solid figures?

What fraction is closest to 3/4? 2/3 3/5 7/10 13/20 Show your working please

What is the value of f(-4) in the piecewise function f(x)= -x-5 for -5<= x <= -2; -x^2+1 for -2<=x<=2; (x-3)^2+2 for 2<=x<=4? If that makes an

What is being personified in the following passage? Fear had settled over the city.