Question

What is the mass of 3.5 moles of NaCl?

A. 5.8 × 101 grams

B. 3.5 × 100 grams

C. 2.0 × 102 grams

D. 6.2 × 101 grams

E. 6.0 × 10–2 grams

Answer 1

Look at this. what do you have to do to solve this?

Answer 2

You still there @RH ?

Answer 3

Look on the image i attached, where you go from mol to mass, it says multiply with molar mass

So multiply 3.5 with the molar mass of NaCl and you'll have your answer

Answer 4

What is the formula mass of NaCl. @RH

Answer 5

Yes I am here, sorry my laptop frooze

Answer 6

so can you find out the formula mass of NaCl ?

Answer 7

@RH can you?

Answer 8

yes, it is 58.4425

Answer 9

is C the correct answer?

Answer 10

lets assume that formula mass of NaCl be 58.5 u .

Answer 11

okk ???

Answer 12

ok

Answer 13

so, \[\huge \bf mole=\frac{weight/mass}{formula~mass}\]
so,
\[\huge \bf 3.5=\frac{Mass}{58.5}\]
now cross multiply them,
\[\huge \bf Mass=3.5 \times 58.5\]

Answer 14

Can you find out the value of mass? @RH

Answer 15

1 mole of Nacl =58.5 gram of Nacl
3.5 moles of Nacl = 58.5* 3.5 = ?

Answer 16

@RH are you still here?

Answer 17

204.75

Answer 18

correct

Answer 19

so C is the correct answer?

Answer 20

yeah.

Answer 21

thanks:)

Answer 22

welcome :)

Answer 23

:)