A sample of an unknown solid is found to have a volume of 24.3 cm3 and a mass of

Chemistry

1 answer:

blondinia [14]2 years ago

5 0

<h2>Answer: 8.93 g/cm³ </h2>

<h3>Explanation: </h3>

Density = mass ÷ volume

= 217.0 g ÷ 24.3 cm³

= 8.93 g/cm³

∴ the unknown sample of mass 217.0 grams and volume of 24.3 cm³ has a density of 8.93 g/cm³.

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What is the heat needed to raise the temperature of 24.7 kg silver from 14.0 degrees Celsius to 30.0 degrees Celsius? Specific h

ELEN [110]

Answer:

$Q=93.3kJ$

Explanation:

Hello,

In this case, by knowing that the heat due to a change of temperature is given by:

$Q=mCp\Delta T$

Whereas Q accounts for the heat, m for the mass, Cp the heat capacity and ΔT for the change in temperature. In such a way the required heat results:

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Sophie [7]

The bond angle marked as ‘a’ in the molecule above is about: D. 120 degrees. That means the angle between the atoms forms a trigonal planar shape.

<h3>What is the bond angle?</h3>

The bond angle is an angle between two bonds that measures in degrees and is calculated by using the spectroscopic method. The bond angle depends on the bonds and the number of lone pairs an atom has.

The molecule above contains 3 electron charge clouds around them: a single bond to carbon, a single bond to oxygen, and a double bond to the other oxygen. Hence, the O-C=O bond angle from the molecule above is 120 degrees.

Learn more about bond angle here brainly.com/question/29235720

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