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Sergeeva-Olga [200]

4 years ago

10

When solute particles are added to a pure solvent in a closed container at a constant temperature and pressure, the vapor pressu

re _________.

1 answer:

zysi [14]4 years ago

4 0

3x^2+12x-8 this is the complete the square that what answers I want because it my homework math

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Neutrons have a<br> charge? <br> neutral<br> negative<br> positive

IgorC [24]

Answer:

Neutrons have a neutral charge

Explanation:

A neutron consists of 3 quarks, 1 up and 2 down. The up quark has a charge of + 2/3e, and the down quarks each have a charge of - 1/3e. So, the charges on the 3 quarks tend to cancel out to produce a neutrally charged particle.

6 0

3 years ago

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How many molecules are there in 0.661 mol of O2 gas?

QveST [7]

Answer:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

5 0

3 years ago

A community needs more electrical energy. The community is located in an

alisha [4.7K]

Answer:

Hydroelectric

7 0

4 years ago

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What is the mass of KNO3(s) that must dissolve in 100. grams of water to form a saturated solution at 50.oC?

Ostrovityanka [42]

The solubility of substance depends upon the temperature. In present case, the solubility of KCl is 84g/100g at <span>50.oC.

This means that, maximum 84g of KCl can be dissolved in 100g of water (at </span>50.oC) to form solution. This solution is referred as saturated solution.

Thus, 84g of <span>KNO3 must be dissolve in 100 grams of water to form a saturated solution at 50 oC.</span>

4 0

4 years ago

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3) (Solid magnesium carbonate mixed in a solution of dilute hydrochloric acid. Assume the

Virty [35]

<u>Answer:</u> The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.

<u>Explanation:</u>

We are given:

Amount of heat released = 1950 J = 1.950 kJ (Conversion factor: 1 kJ = 1000 J)

The chemical equation for the reaction of magnesium carbonate and hydrochloric acid follows:

$MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2;\Delta H_{rxn}=-23.4kJ$

By Stoichiometry of the reaction:

If 23.4 kJ of heat is released, then 1 mole of magnesium carbonate is dissolved

So, when 1.950 kJ of heat is released, then = $\frac{1mol}{23.4kJ}\times 1.950kJ=0.083mol$ of magnesium carbonate is dissolved

To calculate the mass of the substance by given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of magnesium carbonate = 0.083 moles

Molar mass of magnesium carbonate = 84.3 g/mol

Putting values in above equation, we get:

$0.083mol=\frac{\text{Mass of magnesium carbonate}}{84.3g/mol}\\\\\text{Mass of magnesium carbonate}=0.083mol\times 84.3g/mol=6.99g$

Hence, the mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.

4 0

3 years ago