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3 years ago

PLEASE HELP ME! I am confused on this.

Chemistry

1 answer:

zalisa [80]3 years ago

5 0

Answer:

Mohammed has less kinetic energy

Explanation:

m=Kg

V= m/s

KE= kinetic energy = J

the way you work out the answer is:

KE = 1/2 × m × v squared

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A solution of phosphoric acid was made by dissolving 10.0 g of H3PO4 in 100.0 mL of water. The resulting volume was 113 mL. Calc

rodikova [14]

Explanation:

Mass of solute = 10.0 g

mass of solvent(water) = m

Volume of solvent( water) = v = 100.0 mL

Density of water= d = $1 g/cm^3=1 g/mL$

$1 mL= 1 cm^3$

$m=d\times v=1.0 g/mL\times 100.0 = 100.0 g$

Mass of solution(M) = Mass of solute + mass of solvent

M = 10.0 g + 100.0 g = 110.0 g

Volume of the solution = V = 113 mL

Density of the solution = D

$D=\frac{M}{V}=\frac{110.0 g}{113 mL}=0.9734 g/mL$

The density of the solution is 0.9734 g/ml.

Moles of phosphoric acid = $n_1=\frac{10.0 g}{98 g/mol}=0.1020 mol$

Moles of water = $n_2=\frac{100.0 g}{18g/mol}=5.556 mol$

Mole fraction of phosphoric acid = $\chi_1$

$\chi_1=\frac{n_1}{n_1+n_2}=\frac{0.1020 mol}{0.1020 mol+5.556 mol}$

$\chi_1=0.01803$

Mole fraction of water = $\chi_2$

$\chi_2=\frac{n_2}{n_1+n_2}=\frac{5.556 mol}{0.1020 mol+5.556 mol}$

$\chi_2=0.9820$

$[Molarity]=\frac{\text{Moles of solute}}{\text{Volume of solution(L)}}$

Moles of phosphoric acid = 0.1020 mol

Volume of the solution = V = 113 mL = 0.113 L ( 1 mL = 0.001 L)

Molarity of the solution :

$=\frac{0.1020 mol}{0.113 L}=0.903 M$

$[Molality]=\frac{\text{Moles of solute}}{\text{Mass of solvent(kg)}}$

Moles of phosphoric acid = 0.1020 mol

Mass of solvent(water) = m =100.0 g = 0.100 kg ( 1 g = 0.001 kg)

Molality of the solution :

$=\frac{0.1020 mol}{0.100 kg}=1.02 mol/kg$

6 0

3 years ago

Explain the meaning of each term in the symbol aXz

Ede4ka [16]

AXz

Explanation:

It is a chemical notation of nuclide

Here X is the symbol of the element

A is the mass number of element

A=n+p(sum of protons and neutrons)

Z is the atomic number.

For example, 12C6

Hers X is C, symbol of carbon

12 is the mass number and 6 is the atomic number of the carbon.

8 0

3 years ago

Is NaF an acid, base or salt?

Ymorist [56]

Answer:

NaF is a salt

4 0

3 years ago

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What volume of oxygen will be produced by heating 245 kg of pure KClO3 at STP ? (Atomic weight of K = 39, Cl = 35.5 and O = 16)

vagabundo [1.1K]

Answer:

67162.5‬ cubic decimetre (dm3) of O2

Explanation:

Step 1:

Write a balance Chemical equation for the following Reaction

KClO3 ---> KCl + 3/2O2

Step 2:

Calculating moles of KClO3:

Molar mass of KClO3 = 122.55 gm

Given Mass = 245 Kg

Moles of KClO3 = 245 / 122.55

Moles of KClO3 = 1.99 Kmol

Step 3:

According to balance Chemical Equation

1 Mole of KClO3 gives 3/2 moles of O2

1.99 KMole(or 1990 moles) gives "x" moles of O2

By balancing for x, we get

x = (3/2)*1990 moles of O2

x = 2985 moles of O2

Step 4:

Calculating Volume of O2 at STP

V = 2985*22.5 dm3

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3 years ago

Elements in the same period get ______ as you go from left to right

Step2247 [10]

The elements go from metallic to gases from left to right

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3 years ago