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2 years ago

In your video respond to the following question/promt. Make sure you state a clear claim and explain with

Chemistry

2 answers:

Pavlova-9 [17]2 years ago

6 0

Answer:

Vvvbn n njjnjj

Explanation:

Natasha_Volkova [10]2 years ago

5 0

Answer:

Huh

Explanation:

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OS-182 has a half-life of 3.6 days. If a sample started at 175 grams, how much would be led after 18 days?

hodyreva [135]

I think c is correct answer
.............

3 0

2 years ago

Read 2 more answers

Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be

lana66690 [7]

Answer: $P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)$

Explanation:

We are given two reactions which are the two steps of a mechanism:

$P_4(l)+5O_2(g)\rightarrow 2P_2O_5(g)$ ......(1)

$P_2O_5(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)$ .......(2)

To determine the net chemical equation, we will multiply equation 2

$P_2O_5(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)\times 2$

$2P_2O_5(g)+6H_2O(l)\rightarrow 4H_3PO_4(l)$ .......(3)

Adding (1) and (3)

$P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 4H_3PO_4(l)$

Thus, the net balanced chemical equation is:

$P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 4H_3PO_4(l)$

6 0

3 years ago

If 0.340 mol of a nonvolatile nonelectrolyte are dissolved in 3.10 mol of water, what is the vapor pressure PH2O of the resultin

SIZIF [17.4K]

Answer:

21.4 torr

Explanation:

The vapour pressure of a solution is lower than that of the pure solvent. And according to Raoult's law this depends of the amount of solute in the solvent. It is calculated according to the following equation

$P_{A} =X_{A} P^{o} _{A}$

where $P_{A} is the pressure of the solution\\ X_{A} is the mole fraction of the solvent\\ P^{o}_{A}is the mole fraction of pure solvent$

$P_{A}=\frac{3.10 mol}{3.10mol+0.340mol}*23.8torr=21.4torr$

7 0

2 years ago

10 points!! Please give me work with it and I will mark as brainlist.

Georgia [21]

Answer: The molecular formula will be $C_2H_4O_2$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 40.0 g

Mass of O = 53.3 g

Mass of H = 6.66 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{40.0g}{12g/mole}=3.33moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{53.3g}{16g/mole}=3.33moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{6.66g}{1g/mole}=6.66moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{3.33}{3.33}=1$

For O = $\frac{3.33}{3.33}=1$

For H = $\frac{6.66}{3.33}=2$

The ratio of C : O : H = 1: 1: 2

Hence the empirical formula is $COH_2$

The empirical weight of $COH_2$ = 1(12)+1(16)+2(1)= 30g.

The molecular weight = 60 g/mole

Now we have to calculate the molecular formula.

$n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{60}{30}=2$

The molecular formula will be= $2\times CH_2O=C_2H_4O_2$

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2 years ago

What is an Richter scale. ( IN your own words)

Pepsi [2]

Answer:

a richter scale measures the magnitude of an earthquake so in my own words i would say the richter scale measures the size of an earthquake and letting us kniw how big it will be to prepare for it.

5 0

2 years ago