Radio waves are used to transmit information on various channels. What is the wavelength of a radio wave having the frequency of 5.40 × 1010 Hz?

Answer:

168.56

Explanation:

Answer:

48 grams

Explanation:

If p and V are already given, calculate m by multiplying those two values.

m = pV

m = 4/5 * 60/1

m = 240/5

m = 48 grams

The mass of that substance is 48 grams.

Answer:

a community is a place with people and a population is like animals

Answer:

The metal sphere was made of iron.

Explanation:

From the question,

Heat lost by the metal sphere = heat gained by the mercury.

Cm(t₁-t₃) = C'm'(t₃-t₂)................... Equation 1

Where C = specific heat capacity of the metal sphere, m = mass of the metal sphere, C' = specific heat capacity of the mercury, m' = mass of the mercury.

t₁ = initial temperature of the metal sphere, t₂ = initial temperature of the mercury, t₃ = Final temperature of the mixture.

Make C the subject of the equation

C = C'm'(t₃-t₂)/m(t₁-t₃)................. Equation 2

Given: m = 0.5 kg, m' = 4.08 kg, t₁ = 300 °C, t₂ = 20 °C, t₃ = 99 °C

Constant: C' = 140 J/kgK.

Substitute into equation 2

C = [140×4.08×(99-20)]/[0.5×(300-99)]

C = 45124.8/100.5

C = 449.0 J/kgK.

Hence from the specific heat capacity data sheet, the metal is suspected to  be  made of iron.

Answer:

0.010 $.

Explanation:

Hello!

In this case, since 1 troy ounce equals 31.1 grams, we can compute the price of gold per gram first:

[tex]1,838.80\frac{\$}{try\ ounce} * \frac{1try\ ounce}{31.1g} = 59.1\frac{\$}{g}[/tex]

Now, we need to compute the grams of copper in 5.17 x10¹⁷ atoms via the Avogadro's number:

[tex]m=5.17x10^{17}atomsAu*\frac{197.0gAu}{6.022x10^{23}atomsAu} \\\\m=1.69x10^{-4}g[/tex]

Thus, the price is:

[tex]\$ = 59.1\frac{\$}{g}*1.69x10^{-4}g \\\\\$ =0.010\$[/tex]

Best regards!

Answer:

Some places have more earthquakes than others because they sit on the edges of tectonic plates.

Answer:

[tex]M_{K^+}=0.0461M[/tex]

Explanation:

Hello!

In this case, as the amounts are not given, we can assume the following problem that is similar to this one:

"Suppose 0.549g of potassium bromide is dissolved in 100.mL of a 19.0mM aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the potassium bromide is dissolved in it. Round your answer to 3 significant digits."

In such a way, we consider that the molarity of any substance is computed by dividing the moles of solute and the volume of the solution; it means we need to compute the moles of potassium bromide in 0.549 g considering its molar mass is 119.002 g/mol:

[tex]n_{KBr}=0.549gKBr*\frac{1molKBr}{119.002gKBr} =0.00461molKBr[/tex]

It also means that the moles of potassium cations are also 0.00461 mol as 1 KBr molecule has 1 potassium calcium. Moreover, given the volume of the silver nitrate solution, 100 mL, in L it would be 0.100 L, so the molarity of potassium ions turns out:

[tex]M_{K^+}=\frac{0.00461molKBr}{0.100L}\\\\ M_{K^+}=0.0461M[/tex]

Best regards!

Answer:

Mole fraction for benzene is 0.683

Explanation:

We need to determine the colligative property about vapour pressure which formula is:

ΔP = P° . Xm

where P° is vapour pressure of pure solvent.

ΔP = Vapor pressure of pure solvent - Vapor pressure of solution

In this case, our solvent is benzene and the solute is toluene. For this colligative property vapour pressure of solution is lower than pure solvent.

P° of benzene at 20°C is 74.7 Torr

Xm is the value for the mole fraction of solute.

Let's replace data: 74.7 Torr - 51 Torr = 74.7 Torr . Xm

Xm = 0.317 → That's the mole fraction for toluene.

Then, mole fraction for benzene will be: 1 - 0.317 → 0.683

Answer:

1.93391595 grams I hope this helps

Explanation:

Answer:

True

Explanation:

When ice is heated, the ice gains heat.

This heat gained by the ice is both used to break the intermolecular forces in ice to form water, as well as to raise the temperature of the water to it's final temperature.

Answer:

dunno

Explanation:

sorry

Answer:

Blue and Green marbles

Explanation:

We have been given that:

       Number of Marbles:

  Blue(Protons)  = 3

  Green(Neutrons)  = 4

   Red (Electrons)  = 3

The marble that should be placed in the nucleus of a lithium atom  = ?

Solution:

The nucleus of an atom is made up of protons and neutrons.

Protons are the positively charged particles in an atom.

Neutrons do not carry any charges.

  So;

The marble in the nucleus are the Blue and Green marbles.

Answer: blue and green

Answer:

electron and ignore this woejdnks

Answer:

Answer:

i would say the first one!

Answer:

[tex]m_{H_2O_2}=0.317gH_2O_2[/tex]

Explanation:

Hello!

In this case, for the chemical reaction between hydrochloric acid and barium peroxide is:

[tex]BaO_2(s)+2HCl(aq)\rightarrow H_2O_2(aq)+BaCl_2(aq)[/tex]

Thus, since the barium peroxide (169.33 g/mol) and hydrochloric acid (36.45 g/mol) are reacting in a 1:2 mole ratio, we need to identify the limiting reactant first by computing the yielded moles of hydrogen peroxide by each reactant:

[tex]n_{H_2O_2}^{by\ BaO_2}=1.50gBaO_2*\frac{1molBaO_2}{169.33gBaO_2}*\frac{1molH_2O_2}{1molBaO_2}=0.00886molH_2O_2\\\\ n_{H_2O_2}^{by\ HCl}=0.0272\frac{gHCl}{mL}*25.0mL *\frac{1molHCl}{36.46gHCl}*\frac{1molH_2O_2}{2molHCl}=0.00933molH_2O_2[/tex]

That's why the HCl is the limiting reactant, so the resulting mass of hydrogen peroxide, theoretical yield, is:

[tex]m_{H_2O_2}=0.00933molH_2O_2*\frac{34.02gH_2O_2}{1molH_2O_2}\\\\m_{H_2O_2}=0.317gH_2O_2[/tex]

Best regards!

Answer:

cointreau, tequila,lime juice

The [OH-] of NaF solution : 1.7 x 10⁻⁶

Given

0.2 M NaF

Ka of HF is 7.1 x 10⁻⁴

Required

[OH⁻]

Solution

Hydrolysis of NaF salt which is formed from weak acid HF and strong base NaOH

F⁻(aq) + H₂O(l) ⇄ HF(aq) + OH⁻(aq)

General formula :

[tex]\tt [OH^-]=\sqrt{\dfrac{Kw}{Ka}\times M }[/tex]

Input the value :

[OH⁻]=√(10⁻¹⁴/7.1 x 10⁻⁴) x 0.2

[OH⁻]= 1.678 x 10⁻⁶ ≈ 1.7 x 10⁻⁶

Answer:

32.76mole of P

Explanation:

The reaction expression is given as;

          P₄O₁₀  →    4P  +  5O₂

Given parameters:

Number of moles of   P₄O₁₀  = 8.19mol

Unknown:

Number of moles of P produced = ?

Solution:

From the balanced reaction expression;

             1 mole of P₄O₁₀  will produce 4 mole of P

         8.19mole of P₄O₁₀  will therefore produce 4 x 8.19  = 32.76mole of P

Answer:it has one proton,

and one electron

Explanation:

It has one neutron and It has one nucleon

Explanation:

The equation for this reaction is given by;

2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(g)

From the reaction;

2 mol of methanol produces 2 mol of CO2 and 4 mol of water

In terms of mass;

Mass = Molar mass * Number of mol

Methanol;

Mass = 32 g/mol * 2 mol = 64 g

CO2;

Mass = 44 g/mol * 2 mol = 88g

H2O;

Mass = 18 g/mol * 4 mol = 72 g

This means;

64g of methanol produces 88g of CO2 and 72g of water

a) how many grams and molecules of water will be produced

64g of Methanol = 72g of Water

7.5g would produce xg of Water

X = (7.5 * 72) / 64 = 8.4375 g of water

Number of moles = Mass / Molar mass = 8.4375 / 18 = 0.46875 mol

Molecules = moles * Avogadro number =  0.46875 * 6.022 * 10^23 = 2.82 * 10^23 molecules

b) how many grams and molecules of carbon dioxide will be produced

64g of Methanol = 88g of CO2

7.5g would produce xg of CO2

X = (7.5 * 88) / 64 = 10.3125 g of CO2

Number of moles = Mass / Molar mass = 10.3125 / 44 = 0.2344 mol

Molecules = moles * Avogadro number =  0.2344 * 6.022 * 10^23 = 1.411 * 10^23 molecules

Answer:

A. 16.0 grams

B. 3.1 mol of oxygen

Explanation:

A.

The oxygen atom has mass = 2.66x10^-23g

A mole of oxygen atoms can be calculated as:

[2.66x10^-23/1 oxygen atom] x [6.023x10²³ oxygen atoms/1 mol]

= 16.0 grams of oxygen

So a mole of oxygen has 16.0 grams of O2

B.

For 0.050 kg of water, we have 16.0 grams

(0.050x10³g/kg )x (1mol/16)

= 3.1 mol of oxygen

So 3.1 mol of oxygen has mass which is equal to the mass of water.

Answer:

hello your question is incomplete attached below is the complete question

a) 0.12 M

b) Ka = 3.0 * 10^-7

c) Alizarin Yellow R

Explanation:

A) Determine the concentration of the unknown acid

The PH of the unknown acid before addition of NaOH is ; 3.72 ( weak acid )

First determine the moles of of NaOH

= molarity * volume

= 0.10 M * 30.0 ML = 0.0030 mol

at equivalence point

moles of NaOH = moles of unknown acid = 0.0030 mol

volume of unknown acid = 25.0 mL

Next calculate the concentration of the Acid ( HA )

= moles / volume

= 0.0030 mol / 25.0 mL

= 0.12 M

b) Determine the Ka of the unknown acid

attached below is the detailed solution

Ka = 3.0 * 10^-7

c) The indicator that would be a good choice to use in the titration of this acid with NaOH is ; Alizarin Yellow R . this is because the titration is between a strong base and a weak acid.

Answer:See explanation

Explanation:

MOLECULAR REACTION EQUATION;

Al(NO3)3(aq) + 3NaOH(aq) --->Al(OH)3(s) +3NaNO3(aq)

complete ionic equation:

Al^3+(aq) + 3NO3^-(aq)  + 3Na^+(aq) + 3OH^-(aq) ---->Al(OH)3(s) + 3Na^+(aq) + 3NO3^-(aq)

Net ionic reaction equation;

Al^3+(aq) + 3OH^-(aq) ------> Al(OH)3(s)

Answer:

1.0058 g/mL

Explanation:

Note: Specific gravity of a substance is same as the relative density.

R.D = Density of the substance/ Density of water.

R.D = D/D'................... Equation 1

Make D the subject of the equation

D = R.D×D'................. Equation 2

Where R.D = Specific gravity of acetic acid, D = density of acetic acid, D' = density of water.

At 60°C,

R.D = 1.023, D' = 0.9832 g/mL

Substitute into equation 2

D = (1.023×0.9832)

D = 1.0058 g/mL

Hence the density of acetic at 60°C is  1.0058 g/mL

Water is a polar substance, while CCL4 is non polar, which implies that Charged comb and charged balloon will not react with CCL4 as they react with water which is polar substance.

Carbon tetrachloride CCL4 has practically no flammability at lower temperatures.

CCl4  is nonpolar because all the four bonds are symmetrical, and they are they extended in all the directions.

Water is a polar substance, while CCL4 is non polar, which implies that Charged comb and charged balloon will not react with CCL4 as they react with water which is polar substance.

However, when CCL4 is passed into PVC it will be swollen due to the presence of chlorinated hydrocarbon.

Learn more about Carbon tetrachloride here: https://brainly.com/question/10963193

#SPJ1

Answer:

We are tasked to solve for the volume of Gold given that the mass of Gold is equivalent to that of a copper.

Explanation:

Details:

Density of Copper= 8.96 g/ml

Volume of Copper=141 ml

mass of Gold = mass of Copper

Density of Gold=19.3 g/ml

In order to solve for the mass of copper, we need to use the density formula

Density= mass/volume

Since we are to solve for the mass of copper

mass of copper= Density of Copper * Volume of Copper

mass of copper= 8.96 g/ml* 141 ml= 1263.36 g

Thus,

mass of gold=mass of copper=1263.36 g

Hence,

Using still the density formula to solve for the volume of gold,

Volume of gold=mass of gold/ Density of gold

Volume of gold=1263.36 g/ 19.3 g/ml = 65.46 mL

Therefore, the volume of the gold must be 65.46 mL in order to have the same mass of a copper

Answer:Moles of Mg, Cl,  0 =  5.40, 10.80, 43.2

Explanation:

1  mole of Mg(ClO4)2  contains  1 mole of Magnesium, Mg atoms

                                                    2 Moles of Chlorine, Cl atoms

                                                    8 Molresof Oxygen atoms

Such that to find the number of moles of each element, We have that

------1 mole Magnesum  atoms/ 1 mol of  Mg(ClO4)2   x 5.40 moles  of magnesium perchlorate, Mg(ClO4)2 = 1 x 5.40 =5.40 moles

------2 moles ofChlorine atoms/ 1 mol of Mg(ClO4)2   x 5.40 moles of magnesium perchlorate, Mg(ClO4)2 = 2 x 5.40 = 10.80 moles

------8 moles Oxygen atoms/ 1 mol of  Mg(ClO4)2   x 5.40 moles  of magnesium perchlorate, Mg(ClO4)2 = 8 x 5.40 = 43.2 moles