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2 years ago

11

How would your atomic mass prediction have been affected if not all of the water had been evaporated from the calcium carbonate

precipitate (Gravimetric Analysis of a Carbonate Kit)

1 answer:

Yanka [14]2 years ago

6 0

Go to a famlie member, if you can't trust them, trust god. if you cant trust god, BURN IN HELL

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The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for calibrating constant-volume bomb calo

Anit [1.1K]

<h3>Answer:</h3>

28.96 kJ/°C

<h3>Explanation:</h3>

We are given;

Enthalpy change (ΔH) = −3226.7 kJ/mol
The reaction is exothermic since the heat change is negative;
Mass of benzoic acid = 3.1007 g
Temperature change (21.84°C to 24.67°C) = 2.83°C

We are required to find the heat capacity of benzoic acid;

<h3>Step 1: Moles of benzoic acid </h3>

Moles = Mass ÷ molar mass

Molar mass of benzoic = 122.12 g/mol

Therefore;

Moles = 3.1007 g ÷ 122.12 g/mol

= 0.0254 moles

<h3>Step 2: Determine the specific heat capacity </h3>

Heat change for 1 mole = 3226.7 kJ

Moles of Benzoic acid = 0.0254 moles

But;

Specific heat capacity × ΔT = Moles × Heat change

cΔT = nΔH

Therefore;

Specific heat capacity,c = nΔH ÷ ΔT

= (3226.7 kJ × 0.0254 moles) ÷ 2.83°C

= 28.96 kJ/°C

Therefore, the specific heat capacity of benzoic acid is 28.96 kJ/°C

7 0

2 years ago

The pressure of a 609.64 gram sample of F2 in a 88.84 L container is measured to be 2770.96 torr. What is the temperature of thi

Oxana [17]

Answer : The temperature of the gas is, 245.9 K

Explanation :

To calculate the temperature of gas we are using ideal gas equation:

$PV=nRT\\\\PV=\frac{w}{M}RT$

where,

P = pressure of gas = 2770.96 torr = 3.646 atm

Conversion used : (1 atm = 760 torr)

V = volume of gas = 88.84 L

T = temperature of gas = ?

R = gas constant = 0.0821 L.atm/mole.K

w = mass of gas = 609.64 g

M = molar mass of $F_2$ gas = 38 g/mole

Now put all the given values in the ideal gas equation, we get:

$(3.646atm)\times (88.84L)=\frac{609.64g}{38g/mole}\times (0.0821L.atm/mole.K)\times (T)$

$T=245.9K$

Therefore, the temperature of the gas is, 245.9 K

4 0

2 years ago

Explain and illustrate the notation for distinguishing between the different p orbitals in a sublevel.

masha68 [24]

Here, the three different notation of the p-orbital in different sub-level have to generate

The value of azimuthal quantum number (l) for -p orbital is 1. We know that the magnetic quantum number $m_{l}$ depends upon the value of l, which are -l to +l.

Thus for p-orbital the possible magnetic quantum numbers are- -1, 0, +1. So there will be three orbitals for p orbitals, which are designated as $p_{x}$ , $p_{y}$ and $p_{z}$ in space.

The three p-orbital can be distinguish by the quantum numbers as-

For 2p orbitals (principal quantum number is 2)

1) n = 2, l = 1, m = -1

2) n = 2, l = 1, m = 0

3) n = 2, l = 1, m = +1

Thus the notation of different p-orbitals in the sub level are determined.

6 0

2 years ago

A bottle of antiseptic hydrogen peroxide (H2O2) is labeled 3.0% (v/v). How many mL H2O2 are in a 400.0 mL bottle of this solutio

PolarNik [594]

Answer:

= 12 mL H202

Explanation:

Given that, the concentration of H2O2 is given antiseptic = 3.0 % v/v

It implies that, 3ml H2O2 is present in 100 ml of solution.

Therefore, to calculate the amount of H202 in 400.0 mL bottle of solution;

we have;

(3.0 mL/ 100 mL) × 400 mL

= 12 mL H202

6 0

2 years ago

The figure represents a solid block of copper metal in a beaker at 30°C Which of the following best represents the particle arra

maria [59]

Answer:

35

Explanation:

i think it is 30

6 0

2 years ago