1-How many atoms are present in 4.0mol of sodium?2-Convert 3.01 x 1023 atoms of Silicon to moles of Silicon?

Answers

Answer 1

Answer:

Part 1: If 1 mol = 6.022 x 10^23 atoms of anything, including Na, then,

4.0 mol Na = 4 x 6.022 x 10^23 atoms Na = 2.4 x 10^24 atoms Na

Part 2: 3.01E23 / 6.022E23 and the answer comes out to .49983394 you would then round this to .500 with significant figures. Hope I helped. :)

Answer 2

Answer:

1=2.4*10^24 atoms NA

2= .49983394 round this to .500

Hope this helps!

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Sound waves entering the ear first strike the .

hammer,anvil,eardrum,cochlea

Answers

I believe it is the Eardrum, Hammer, Anvil then Cochlea.

Calculate the mass of water produced when 2.15 g of butane reacts with excess oxygen in the equation 2C4H10(g)+13O2(g)→10H2O(g)+8CO2(g)

Answers

molar mass :

H₂O = 18.0 g/mol

C₄H₁₀ = 58.0 g/mol

2 C₄H₁₀(g)+ 13 O₂(g) →10 H₂O(g)+ 8 CO₂(g)

2 x ( 58.0) g -------------- 10 x ( 18.0 ) g
2.15 g -------------------- mass of water

mass of water = 2.15 x 10 x 18.0 / 2 x 58.0

mass of water = 387 / 116

mass of water = 3.336 g

hope this helps!

Fe2O3 + H2 --> Fe + H2OA) what mass of hydrogen gas must be consumed to produe 10.0 g of iron metal?

B) what mass of iron(lll) oxide, Fe2O3, must be consumed to prepare 2.50g of iron metal

Answers

A) 10.0g of Iron is $(10.0)/(55.8)=179mmol$ of Iron.

One mole of dihydrogen is required to form one mole of iron, hence you'll need $0.179*1.00=0.179g$ of dihydrogen.

B) Likewise : 2.50g of Iron is $(2.50)/(55.8)=44.8mmol$ of Iron, hence we'll need $44.8*(3*16+2*55.8)=7.15g$ of Fe2O3.

During all chemical reactions, mass, energy and charge are

Answers

conserved. if its absorbed then there will be no reaction.

What is the result of adding KF to an equilibrium mixture of the weak acid HF?HF(aq)⇔H+(aq)+F-(aq).

a. F- concentration decreases
b.the dissociation constant, K, increases
c. HF concentration decreases
d. H+ concentration decreases

Answers

When gaseous hydrogen chloride is passed through a sodium chloride solution, precipitation of the sodium chloride occurs as a result of an excess of chloride ions in the solution (caused by the dissociation of HCl). Here the concentration of H⁺ decreases. The correct option is D.

What is common-ion effect?

When another electrolyte (which includes an ion that is also present in the first electrolyte, i.e., a common ion) is added, the common ion effect suppresses the ionisation of the first electrolyte. It is thought to be a result of Le Chatlier's principle, often known as the equilibrium law.

An increase in the concentration of one of the ions dissociated in the solution by the addition of another species containing the same ion will result in an increase in the degree of association of ions in a solution where there are several species associating with each other via a chemical equilibrium process.

Here the common ion 'F' in KF supresses the dissociation of HF.

Thus the correct option is D.

To know more about common ion effect, visit;

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Answer D. Follow Le Chatelier's principle.

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?

Answers

Specific heat capacity is the required amount of heat per unit of mass in order to raise teh temperature by one degree Celsius. It can be calculated from this equation: H = mCΔT where the H is heat required, m is mass of the substance, ΔT is the change in temperature, and C is the specific heat capacity.

H = mCΔT
2501.0 = 0.158 (C) (61.0 - 32.0)

C = 545.8 J/kg·°C

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