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2 years ago

I need help with solution

Chemistry

2 answers:

vlada-n [284]2 years ago

5 0

$molar \: mass = 48 \\ element = cadmium$

NARA [144]2 years ago

5 0

Answer:

A.) Titanium

Explanation:

The graph appears to be a mass spectrum. This graph describes the abundance of an element in a sample. The x-axis measures the mass of the element. As such, you can identify the element by determining which element has an atomic weight (g/mol) that matches the highest peak.

Titanium = 47.867 g/mol

Cadmium = 112.41 g/mol

Vanadium = 50.942 g/mol

The highest peak appears to be at 48. From these atomic weights, it seems that titanium is the element with the closest mass.

This graph is measuring an unknown element, so ideally, there would be only one peak. If this is a graph of one element, then why are their multiply smaller peaks? The smaller peaks are most likely isotopes or impurities.

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How do subscripts represent the charge balance of ions

finlep [7]

<h3><u>Answer and explanation</u>;</h3>

To balance the charges of ions the number of electrons lost is equal to the number of electrons gained. The overall net charge must be zero.
The number of ions needed to accomplish this is represented by the subscripts.
For any given ionic compound, the product of the charge on the ion (or multiatomic ionic group) times the subscript of the ion will give a total charge of zero when all ions are considered.

For examples: NaCl Na = +1 Cl = -1 total is zero

5 0

4 years ago

What is the value of the van't Hoff factor for KCl if a 1.00m aqueous solution shows a vapor pressure depression of 0.734 mmHg a

yaroslaw [1]

<u>Answer:</u> The Van't Hoff factor for KCl is 1.74

<u>Explanation:</u>

We are given:

Molality of solution = 1 m

This means that 1 mole of a solute is present in 1 kg of solvent (water) or 1000 grams of water

To calculate the number of moles, we use the equation:

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

Given mass of water = 1000 g

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

$\text{Moles of water}=\frac{1000g}{18g/mol}=55.56mol$

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B}$

Moles of solute = 1 moles

Total moles = [1 + 55.56] = 56.56 moles

Putting values in above equation, we get:

$\chi_{(solute)}=\frac{1}{56.56}=0.0177$

The equation used to calculate relative lowering of vapor pressure follows:

$\frac{p^o-p_s}{p^o}=i\times \chi_{solute}$

where,

$\frac{p^o-p_s}{p^o}$ = relative lowering in vapor pressure = 0.734 mmHg

i = Van't Hoff factor = ?

$\chi_{solute}$ = mole fraction of solute = 0.0177

$p^o$ = vapor pressure of pure water = 23.76 torr

Putting values in above equation, we get:

$\frac{0.734}{23.76}=i\times 0.0177\\\\i=1.74$

Hence, the Van't Hoff factor for KCl is 1.74

7 0

3 years ago

A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen,

levacccp [35]

Answer:

cant understand the grammer rewrite and ill answer

Explanation:

4 0

3 years ago

Is MgCO3 a correct chemical formula

spin [16.1K]

Yes you are very correct

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3 years ago

In an experiment, the independent variable

Stolb23 [73]

Answer:

In an experiment the independent variable is special type of control which is control by the experimenter, and it effect the dependent variable.

Explanation:

In dependent variable:

The dependent variable is the variable which is controlled by the experimenter to check its effect on dependent variable.

Dependent variable:

It is variable which being measured in an experiment and which is directly depend upon independent variable.

The both variables are relate in term of cause and effect. The independent variable is changed by experimenter and its effect produce in dependent variable is then measure.

For example:

To measure how sleep of student effect the test score. The time for a sleep is given by experimenter it is independent variable which may exceed or decreased. It depend upon experimenter choice but the effect on score is dependent variable which depend upon the time of sleep.

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3 years ago