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Olenka [21]
3 years ago
8

A lead mass is heated and placed in a foam cup caloriemeter containing 40.0mL of water at 17.0 C. The water reaches a temperatur

e of 20.0 C. How many joules of heat were released by the lead?​
Chemistry
1 answer:
Mrrafil [7]3 years ago
8 0

the Answer is             502 Joules

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Question 6 A certain ionic compound has a solubility in water of at . Calculate the greatest mass of that could be dissolved in
emmainna [20.7K]

Complete Question:

A certain ionic compound X has a solubility in water of .765g/ml at 5 degrees C. Calculate the mass of X that's dissolved in 3 L of a saturated solution of X in the water at this temp. Be sure your answer has the correct unit symbol and significant digits.

Answer:

2.29 kg

Explanation:

A saturated solution is a solution that has the maximum amount of solute diluted at it, so if more solute is added, it will precipitate. The solutions can also be unsaturated (when more solute can be dissolved) or supersaturated (when there is more solute dissolved than the maximum. It's a very unstable solution).

The saturation is measured by the solubility, which indicates how much mass of the solute can be added to a certain volume of the solvent. So, the solubility (S) is the mass (m) divided by the volume (V).

For a solution with 3 L = 3000 mL,

S = m/V

0.765 = m/3000

m = 3000 * 0.765

m = 2295 g

m = 2.29 kg

7 0
3 years ago
Modern periodic table is less defective than mendeleev's periodic table. Give two reasons​
Talja [164]

Answer:

there is no chance of any defects. 2) The position of isotopes becomes clarified in modern periodic table. That is the main two reasons as to why modern periodic table is less defective than Mendeeleev's periodic table.

Explanation:

Reason 1:- It is based on atomic number.

Reason 2:-Problem regarding Position of isotopes is resolved.

Reason 3:-Problem of position of Cobalt and Nickel is resolved whigh were placed wrongly in mandeelev periodic table.

Reason 4:-Blank spaces which were there in mandeelev periodic table are no more vacant now.

4 0
3 years ago
What is the function of control rods in a nuclear reactor?
trapecia [35]
The answer is
C. Control reaction rate
hope it helps :)

4 0
3 years ago
Read 2 more answers
An element has a mass of 207 and 125 neutrons in its nucleus. How many protons & electrons does it have & where are they
SashulF [63]

The number of protons can be calculated by subtracting 207 with 125

Therefore, proton no. : 207 - 125

                                    = 32

Proton number and electron number is always equivalent, so there are 32 electrons in the electron shells

Protons and neutrons are always located in the nucleus of an atom, and electrons are located in the electron shells which always move rapidly around the atom

The element which is referred is Lead(Pb)

7 0
3 years ago
The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in th
Ludmilka [50]

The sample contains 1.00 mol H₂O.

Moles of water = 18.0 g H₂O × 1 mol H₂O/18.0 g H₂O = 1.00 mol H₂O

3 0
3 years ago
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