Question

The typical American diet has too much salt (NaCl) in it. A healthy adult should limit his or her salt intake to 1 tsp of salt maximum per day, which equals about 6 g. b. How many moles should an adult's maximum intake be? (2 points)

c. How many molecules of NaCl is the daily maximum? (2 points)

Answer 1

for a) use: \(\sf moles=\dfrac{mass ~(in~g)}{Molar ~mass~(in~g/mol)}\)

for b) use: \(\sf moles=\dfrac{particles }{Avogadro's~number}\)

particles in this case are molecules

Answer 2

ok so can you check my work?

Answer 3

What is the molar mass of NaCl? (2 points)
b. How many moles should an adult's maximum intake be?
c. How many molecules of NaCl is the daily maximum?

d. What are the percent compositions of Na and Cl in NaCl? (Round your answers to the nearest tenth percentage.)
e. Processed foods often contain large amounts of salt, but it is actually sodium (Na) that causes health concerns. If 6 g of salt (NaCl) should be an adult's daily maximum, what would the daily maximum of just sodium (Na) be? Give your answer in milligrams.
f. The sodium (Na) content of 1 particular can of soup is 890 mg sodium in 1 c. What is the molarity of sodium (Na) in the soup? (Note: 4 c = 1 qt, and 1 qt = 0.946 L.)

Answer 4

post one question at a time please.

Answer 5

so for a. 58.55 g/mol
d. Na = 39.3 percent, Cl = 60.7 percent

Answer 6

sorry okay so first question

Answer 7

What is the molar mass of NaCl?
I got 58.4 g/mol

Answer 8

can you check thanks!

Answer 9

yep thats the molar mass, the question asks for moles though

Answer 10

oh wait sorry, thats b).

Answer 11

nope the question asks for molar mass okay :)

Answer 12

i dont understand b and c though

Answer 13

so would i do 6g
divided

Answer 14

*divided by 58.55 g/mol

Answer 15

yep thats it

Answer 16

what about c though..

Answer 17

use the second equation i posted using the moles you get from part b)

ps. Avogadro's number is a constant

Answer 18

i know avogrado's number = 6.02

Answer 19

well 6.02 x 10^23

Answer 20

but what do you mean by particles?

Answer 21

0.103*6.023*10^23

Answer 22

got it !

Answer 23

thats it

Answer 24

okay so i got answers for e, f, and g

Answer 25

can you check them?

Answer 26

e= 2359 mg, f= 0.2 m NA

Answer 27

sorry just f and g

Answer 28

there is no g)

Answer 29

yea i know i meant just e and f sorry !

Answer 30

sorry i have this huge chem assignment due tomorrow and i kinda fell asleep in class ahh

Answer 31

both are incorrect

Answer 32

wait can you correct me then? for part e, i did 39.3 percent times 6 g

Answer 33

and for part f i did 890/22.989 g/mol = 0.0387 moles
i converted to 0.2365 L
and i did molarity = 0.0387 / 0.2365 L = 0.2

Answer 34

Oh wait e) is fine.

For f, you forgot to convert mg to g.

Answer 35

oh and here are the questions again:
The typical American diet has too much salt (NaCl) in it. A healthy adult should limit his or her salt intake to 1 tsp of salt maximum per day, which equals about 6 g. Use this information to answer the following questions. (Round atomic masses to the nearest tenth unit.)
E. Processed foods often contain large amounts of salt, but it is actually sodium (Na) that causes health concerns. If 6 g of salt (NaCl) should be an adult's daily maximum, what would the daily maximum of just sodium (Na) be? Give your answer in milligrams.
F. The sodium (Na) content of 1 particular can of soup is 890 mg sodium in 1 c. What is the molarity of sodium (Na) in the soup? (Note: 4 c = 1 qt, and 1 qt = 0.946 L.)

Answer 36

okay so e is 2358 mg

Answer 37

wait no i did f right

Answer 38

i'll post a file hold on.

Answer 39

i did do g

Answer 40

nope, your mass should be in grams. Otherwise the units in the molar mass wouldn't cancel.

Answer 41

wait a sec. i have a copy written

Answer 42

you converted mg to grams in this, but not in what you posted. so it's right

Answer 43

so is 0.2 m Na right?

Answer 44

yes, use a capital M for molarity as lowercase m means molality

Answer 45

oh okay. thank you so much. most helpful responses!

Answer 46

if you don't mind, i have a few more questions

Answer 47

no problem! post 1 question per thread though

Answer 48

okay