1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Setler79 [48]
3 years ago
6

An over-the-counter multi-vitamin has 350 mg tablets that are 20% calcium by mass. How many tablets are required for you to take

a 0.35 g dose of calcium?
Chemistry
2 answers:
Marina86 [1]3 years ago
7 0
.2x350mg = 70mg which converts to .070g.
.35g/.070g = 5 tablets.
yan [13]3 years ago
7 0

Answer:

5  tablets are required for you to take a 0.35 g dose of calcium.

Explanation:

The amount of calcium required = 0.35 g

Percentage of calcium by mass in calcium carbonate = 20%

Total mass of 1 tablet of multi-vitamin =350 mg = 0.35 g

let the number of tablet of multi-vitamin be x

Total mass of tablets = x × 0.35

\%=\frac{\text{Mass of an element}}{\text{Total mass of tablets}}\times 100

20\%=\frac{0.35 g}{x\times 0.350 g}\times 100

x = 5

5  tablets are required for you to take a 0.35 g dose of calcium.

You might be interested in
A chemist lectures about the following definition for acids and bases. The acid-base behavior is analyzed in terms of how electr
Y_Kistochka [10]

Answer:

the Lewis concept of acids and bases

Explanation:

8 0
3 years ago
Read 2 more answers
Calculate the molarity of a solution of Nach if it contains 7.2.g Nach in 100.0 mL of solution. andver: m Nach . .
Norma-Jean [14]

Answer:

1.23 M

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity  

V = volume of solution in liter ,

n = moles of solute ,

Moles is denoted by given mass divided by the molecular mass ,  

Hence ,  

n = w / m

n = moles ,  

w = given mass ,  

m = molecular mass .

From the question ,

w = given mass of NaCl = 7.2 g

As we know , the molecular mass of NaCl = 58.5 g/mol

Moles is calculated as -

n = w / m  =  7.2 g / 58.5 g/mol = 0.123 mol

Molarity is calculated as -

V = 100ml = 0.1 L            (since , 1 ml = 1/1000L )

M = n / V  =  0.123 mol / 0.1 L = 1.23 M

5 0
3 years ago
Describe how you would create a model of sea-floor spreading using everyday materials
Elodia [21]

Answer:

Take a cardboard, cylinder-shaped container and cut a vertical slit about 3 ½ inches long and ¼ inch wide down the side. The slit is your mid-ocean ridge, the place where the plates are moving away from each other.

Cut a piece of white paper in half lengthwise.

On each piece of paper, measure two inches in from the end and fold the paper so that there is a section on each end to hold onto.

Measure inward another two inches from the fold, and color in that two-inch wide strip.

Continue to measure in two-inch segments, coloring every other section.

Place the unfolded ends of the paper into the slit in the container. Holding them by the folds, pull the pieces of paper out again. If you imagine that the slit is the midocean ridge where the plates are moving away from each other, the paper is the new liquid rock coming out from the ridge. The first bit of paper to come out is the oldest rock, and the last section of paper to come out is the youngest. Imagine that your paper goes on forever. Soon, the first bit you took out of the hole will be far away from the midocean ridge. Of course, “soon” in geological time is a very long time in human terms!

Take your pieces of paper and tape the ends that aren’t folded to the pencil.

Put the pencil inside of the container and pull the ends of the pieces of paper up through the slit.

Twist the pencil one way, and the papers will move out and away from each other. This is what happens at a divergent plate boundary on the mid-ocean ridges.

Twist the pencil the other way, and the papers will move in and toward each other. This is what happens at a convergent plate boundary. Imagine what would happen if those papers had bumps on them. They’d get all bunched together at the hole, and create mountains.

Explanation:

4 0
3 years ago
How many moles are in 7.46 x 1025 particles of iron
sladkih [1.3K]

Answer:

1 mole of iron =6.023×10^23 particles

1 particles of iron=1/6.023×10^23 mole

7.46×10^25 particles =1/6.023×10^23×7.46×10^25

=1.238×10^48 mole is a required answer.

4 0
3 years ago
You have 54.32 grams of PbCl4. How many moles of PbCl4 do you have?
xxTIMURxx [149]
Answer is 0.1565417867........

4 0
2 years ago
Other questions:
  • What volume of 0.350 m koh is required to react completely with 24.0 ml of 0.650 m h3po4?
    15·1 answer
  • What is the mass of 0.28 moles of iron
    15·2 answers
  • Which of the following statements about the density of the blue object is true?
    12·1 answer
  • How does a physical change obey the law of conservation of mass?
    12·1 answer
  • How many subshells are in the n =4 shell?
    7·1 answer
  • Are inic bonds formed when electrons are equally or unequally shared
    14·1 answer
  • Bob and Ada are camping and have sweet potatoes wrapped in foil to eat. Ada put her sweet potato in the bonfire for a while, but
    8·1 answer
  • List and describe the four layers of the Earth.
    15·2 answers
  • Suppose you are working in a chemistry lab and trying to make a solution of a substance called Sodium Chloride (which is a solid
    11·1 answer
  • When nahco3 completely decomposes, it can follow this balanced chemical equation: 2nahco3 → na2co3 h2co3 determine the theoretic
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!