Why is important for the lens to be attached to the muscles in the eye?

A 0.649 g sample containing only K2SO4 (M.M. 174.25) and (NH4)2SO4 (M.M. 132.13) was dissolved in water and treated with Ba(NO3)

Delvig [45]

Based in the data provided, the percentage by mass of K2SO4 is 60.55 %.

<h3>What is the mass of K2SO4 in the mixture?</h3>

The mass of K2SO4 in the mixture is obtained from the data given as follows:

Total mass of sample = 0.649 g

Let the mass of K2SO4 in the mixture be X g

Mass (NH4)SO4 = (0.649 - X )g

Moles of K2SO4 = X g/174.25 g/mol

= 0.00574X mol

Moles of (NH4)2SO4 = (0.649 - X)g / 132.13 g/mol

= (0.00491 - 0.00757X) mol

Total number of moles SO42- ions precipitated = 0.00574X mol + (0.00491 - 0.00757X)mol

= (0.00491-0.00183X) mol

Mole ratio of SO42- ions to Ba2+ ions = 1:1

Thus, moles of Ba2+ ions = (0.00491 - 0.00183X)mol

Moles of BaSO4 precipitated = 0.977 g/233.38 g/mol = 0.00419 moles

1 mole of BaSO4 produces 1 mole of Ba2+ ions

Therefore,

(0.00491 - 0.00183X) mol = 0.00419mol

0.00183X = 0.00491 - 0.00419mol

0.00183X = 0.00072

X = 0.00072/0.00183 = 0.393 g

Mass of K2SO4 = 0.393 g

Percentage by mass of K2SO4 = (0.393/0.649) × 100

Percentage by mass of K2SO4 = 60.55 %

Learn more about percentage by mass at: brainly.com/question/26150306

3 0

2 years ago

A generic element, Z, has two isotopes, 45Z and 47Z, and an average atomic mass of 45.36 amu. The natural abundances of the two

Dmitry_Shevchenko [17]

Answer:

46.96 amu

Explanation:

Isotopes are different kinds of same elements. The difference between two isotopes of the same element is the number of neutrons.

To get the relative atomic mass, we take into consideration the masses of the different isotopes. This is done by multiplying their abundances by their masses. They are then added together to get the relative atomic mass of the element.

Let the isotopic mass of 47Z be x

45.36 = [80/100 * 44.96] + [20/100 * x]

45.36 = 35.968 + 0.2x

0.2x = 45.36 - 35.968

0.2x = 9.392

x =9.392/0.2 = 46.96 amu

5 0

3 years ago

Chlorine atom

irina [24]

Answer:

C. Decomposition of potassium permanganate(Heating)

Explanation:

The equation of the reaction is given as;

2KMnO4 -> K2MnO4 + MnO2(s) + O2(g)

Reactant = 2KMnO4

Products = K2MnO4 + MnO2(s) + O2(g)

A. Oxygen turned in to carbon dioxide

Incorrect option - Oxygen is not the reactant

B. Sulphate and lithium boiled

Incorrect option - Sulphate and lithium are not part of this reaction

C. Decomposition of potassium permanganate(Heating)

Correct option - potassium permanganate decomposed to form K2MnO4 + MnO2(s) + O2(g)

D. None of the above

Incorrect option

8 0

3 years ago

A sample of a monoprotic acid (ha) weighing 0.384 g is dissolved in water and the solution is titrated with aqueous naoh. if 30.

posledela

The formula for the monoprotic acid is taken as HA, reaction with base is as follows;
HA + NaOH ---> NaA + H₂O
Stoichiometry of acid to base is 1:1
At the neutralisation point, number of HA moles = number of base moles
Number of NaOH moles reacted = 0.100M / 1000 mL /L x 30.0 mL = 0.003 mol
Therefore number of HA moles reacted = 0.003 mol
the mass of acid 0.384 g
Therefore molar mass - 0.384 g/ 0.003 mol = 128 g/mol

3 0

3 years ago

When droplets of water in the atmosphere act like prisms the colord in sunlight undergo

Butoxors [25]

When droplets of water in the atmosphere act like prism the color in the sunlight undergo interferance, making rainbows. ( This is how rainbows form)

6 0

3 years ago

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