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4 years ago

Can u answer them both thx

Chemistry

1 answer:

solong [7]4 years ago

5 0

question 1, true, question 2, false, question two because atoms are protons, neutrons, and electrons.

Hope this helps, if not, comment below please!!!

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I need help on #2 a and b. please explain steps and answer

Vaselesa [24]

I think A. o2 is oxygen, h202 is a clear liquid like bleach, And H20 is water lol :P

4 0

3 years ago

A 1.30M solution of BaCl2 has a density of 1.230 g/ml. a) What is the mole fraction of BaCl2 in this solution?

Elodia [21]

Answer: The mole fraction of barium chloride in the solution is 0.024

Explanation:

We are given:

Molarity of barium chloride solution = 1.30 M

This means that 1.30 moles of barium chloride is present in 1 L or 1000 mL of solution.

To calculate the mass of solution, we use the equation:

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

Density of solution = 1.230 g/mL

Volume of solution = 1000 mL

Putting values in above equation, we get:

$1.230g/mL=\frac{\text{Mass of solution}}{1000mL}\\\\\text{Mass of solution}=(1.230g/mL\times 1000mL)=1230g$

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Moles of barium chloride = 1.30 moles

Molar mass of barium chloride = 208 g/mol

Putting values in equation 1, we get:

$1.30mol=\frac{\text{Mass of barium chloride}}{208g/mol}\\\\\text{Mass of barium chloride}=(1.30mol\times 208g/mol)=270.4g$

Mass of water = Mass of solution - Mass of barium chloride

Mass of water = 1230 - 270.4 = 959.6 g

Calculating the moles of water:

Given mass of water = 959.6 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{959.6g}{18g/mol}\\\\\text{Moles of water}=53.31mol$

Mole fraction of a substance is given by:

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

For barium chloride:

$\chi_{\text{(barium chloride)}}=\frac{n_{\text{(barium chloride)}}}{n_{\text{(water)}}+n_{\text{(barium chloride)}}}$

$\chi_{\text{(barium chloride)}}=\frac{1.30}{1.30+53.31}\\\\\chi_{\text{(barium chloride)}}=0.024$

Hence, the mole fraction of barium chloride in the solution is 0.024

6 0

4 years ago

How many atoms of hydrogen are present in 8.29 g of water?

AlexFokin [52]

If u want the real answer go to answers.com

8 0

4 years ago

Read 2 more answers

The density of osmium, which is the densest metal, is 22.57 g/cm^3. What is the mass of a block of osmium that measures 1.00 cm

olganol [36]

Density = Mass / Volume
V = 1.00 * 4.00 * 2.50 = 10 cm³
22.57 g/cm³ = Mass / 10 cm³
M = 22.57 g/cm³ * 10 cm³
M = 225.7 g
Answer: The mass of the block of osmium is 225.7 g.

7 0

3 years ago

Read 2 more answers

What is the mass percent of oxygen in Nickel (III) sulfate?

NeX [460]

The mass percent of oxygen in Nickel( $III$ )sulfate is $23.68$ percent.

At first, we look up the atomic masses for the element from the periodic table.

The atomic masses are found to be:

Ni is $58.7$
S is $32$
O is $16$

Next, we determine how many grams of each element are present in one mole of $Ni_{2}(SO_{4})_{3}$

$117.4g(2 mol*58.7)$ of Ni
$96g(3 mol*32)$ of S
$192g(12 mol * 16.00)$ of O

The mass of one mole $Ni_{2}(SO_{4})_{3}$ is:

$117.4g+96g+192g=405.4g$

So, The mass percent of oxygen $=(96g/405.4)*100=0.2368*100%\\$

$=23.68 %$ percent.

To learn more about Mass percent, refer to:

brainly.com/question/25255030

3 0

2 years ago