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2 years ago

The density of gold is 19.32. Give two reasons why this statement is incomplete

Chemistry

2 answers:

makvit [3.9K]2 years ago

6 0

Answer: The units and conditions are not written.

Explanation:

Density is defined as the ratio of mass of a substance to the volume of substance. The equation used to calculate density of a substance follows:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

This property is expressed in g/mL or kg/L

Density depends on temperature and pressure of the system.

As, the temperature of the system increases, the particles move freely which increases the volume of system and leads to the decrease of density.

As, the pressure of the system increase, the particles come closer to one another which decreases the volume of system and leads to the increase of density.

So, for the given value of density, two reasons are:

Units are not given.
Conditions are not mentioned.

DerKrebs [107]2 years ago

3 0

A: there is no unit. b: it doesn't present the temperature and pressure

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Mnenie [13.5K]

Answer:

= 230 ppb

Explanation:

Considering that;

1ppm = 1mg/L

Then;

0.00023g = 0.23mg

Therefore;

0.00023 g/L = 0.23 mg/L

0.23 mg/L = 0.23 ppm

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Therefore;

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1 year ago

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Use the specific heat capacity that you calculated for granite to determine how many grams of granite at the initial temperature

Valentin [98]

Answer:

Explanation:

specific heat of granite s = .79 J / g / k

let the mass of granite = m

heat lost by granite = heat gained by water

heat lost = mass x specific heat x drop in temperature

= m x .79 x (80 - 20.45)

heat gained by water

= 3000 x 4.186 x (20.45- 20)

heat lost by granite = heat gained by water

m x .79 x 59.55 = 3000 x 4.186 x .45

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2 years ago

Using the following thermochemical equation, determine the amount of heat produced from the combustion of 24.3 g benzene (C6H6).

Anna007 [38]

Answer:

ΔH = -976.5 kJ

Explanation:

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The value of ΔH, the enthalpy, is a way of measurement of the heat, and it depends on the quantity of the matter (number of moles).

So, 24.3 g of benzene has :

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n = 24.3/78.11

n = 0.311 moles

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1 year ago

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