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

which one do u thin k

Answer 2

I was thinking A?

Answer 3

what does 1 mole of NaCl weigh?

the periodic table should be your best friend right about now

Answer 4

Na = 22.99 g/mol

Answer 5

yep and Cl = 35.453 g/mol
so NaCl = 22.989 + 35.453 = 58.442 g/mol
now multiply that by the number of moles

Answer 6

Is C correct?

Answer 7

58.442 * 3.5 = 204.547 grams
If you write that in scientific notation you'll get 2.04 x 10^2 grams
So C is correct

Answer 8

Thanks :)!