How much does 2 moles of NaCl (molar mass =58g) weigh? a. 116 g
b. 72 g
c. 80 g
d. 58 g

Here's the solution ~

1 mole of NaCl weigh 58 grams

2 moles of NaCl weigh (58 × 2) = 116 grams

therefore, the correct choice is A.)

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

2b2t

explanation:

2b2t