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
klasskru [66]
3 years ago
15

A 10.11 g sample of NaBr contains 22.34 % Na by mass. Considering the law of constant composition (definite proportions), how ma

ny grams of sodium does a 7.09 g sample of sodium bromide contain
Chemistry
1 answer:
Ksenya-84 [330]3 years ago
8 0

Answer:

1.58\ \text{g}

Explanation:

10.11 g sample of NaBr contains 22.34% Na by mass

According to the law of constant composition the if one sample of NaBr has 22.34% of Na by mass then any other sample of NaBr will have the same percentage of the amount of Na.

For a sample of 7.09 g we have

7.09\times \dfrac{22.34}{100}=1.583906\approx 1.58\ \text{g}

The mass of sodium in the required sample is 1.58\ \text{g}.

You might be interested in
Help please! -A compound contains 0.013 moles of carbon, 0.039 moles of hydrogen and 0.0065 moles of oxygen. Determine the empir
stepan [7]

A) C2H6O1

To find the emperical formula, divide each mole value by the smallest

For carbon, 0.013/0.0065 = 2

For hydrogen, 0.038/0.0065= 6

For oxygen, 0.0065/0.0065= 1

Emperical formula = C2H6O1

8 0
2 years ago
Read 2 more answers
Cuantos gramos necesito para preparar una solución de 500 ml al 35% de NaCl
Iteru [2.4K]
A patient who is prescribed a dose inhaler will find that it must be filled with a) medicine in powder form only. Works with lower (not upper) respiratory diseases only. Full of medicine used to give a fixed amount of medicine per oral inhalation. d) Medication in the form of a spray only.
6 0
3 years ago
Determine the amount of heat(in Joules) needed to boil 5.25 grams of ice. (Assume standard conditions - the ice exists at zero d
Yuki888 [10]
Following are important constant that used in present calculations
Heat of fusion of H2O = 334 J/g 
<span>Heat of vaporization of H2O = 2257 J/g </span>
<span>Heat capacity of H2O = 4.18 J/gK 
</span>
Now, energy required for melting of ICE = <span>  334 X 5.25 = 1753.5 J .......(1)
Energy required for raising </span><span>the temperature water from 0 oC to 100 oC =  4.18 X 5.25 X 100 = 2195.18 J .............. (2)
</span>Lastly, energy required for boiling water = <span>  2257X 5.25 = 11849.25 J ......(3)
</span><span>
Thus, total heat energy required for entire process = (1) + (2)  + (3)
                                                                        = 1753.5 + 2195.18 + 11849.25
                                                                        = </span><span>15797.93 J 
</span><span>                                                                        = 15.8 kJ
</span><span>Thus, 15797.93 J of energy is needed to boil 5.25 grams of ice.</span>
7 0
3 years ago
Q2. Which formula represents a homogeneous mixture?
bija089 [108]

Answer:

D) HCl(aq)

Explanation:

A homogeneous mixture can be defined as any liquid, solid or gaseous mixture which has an identical or uniform composition and properties throughout any given sample of the mixture. In Chemistry, all solutions are considered to be a homogeneous mixture.

In this scenario, the chemical formula which represents a homogeneous mixture is aqueous hydrogen chloride, HCl(aq). The aqueous hydrogen chloride is a homogeneous mixture of water and hydrogen chloride. This ultimately implies that, aqueous hydrogen chloride HCl(aq) is a solution of hydrogen chloride in water and it is commonly referred to as Hydrochloric acid.

Given by the chemical equation;

HCl(aq) + H_{2}O(l)  →  H_{3}O^{+} (aq) + Cl_{−}(aq)

8 0
3 years ago
The tip of a match is ignited as it is struck against the matchbox. Why is this a chemical change?
LUCKY_DIMON [66]
The answer is A, because of the chemical reaction taking place color can change (as in this case). Hope it helps!
5 0
3 years ago
Read 2 more answers
Other questions:
  • True False The colors emitted depends on the number of free electrons passing through the lamp. True False When a free electron
    11·1 answer
  • what mass of lithium chloride, licl must be dissolved to make a 0.194M solution that has volume of 1.00 l
    6·1 answer
  • Write a sentence that descrices how to determine the number of moles of a compound in known mass of a
    14·1 answer
  • During which changes of state does the motion of the atoms decrease?
    10·2 answers
  • Which of the following objects would have the most inertia?
    7·2 answers
  • A cubic meter is about the same as the volume occupied by a ____
    6·1 answer
  • Suppose 2.4 g of Mg reacts with 10.0 g of O2, to create magnesium oxide. How much magnesium oxide is produced?
    13·1 answer
  • Which describes Bohr’s contribution to the atomic model?
    7·1 answer
  • Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with ox
    12·1 answer
  • Within the visible spectrum, red light has
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!