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4 years ago

What pressure (in atmospheres) does a gas exert when at 385 mm of Hg?

Chemistry

1 answer:

Westkost [7]4 years ago

6 0

To find out the pressure in atm. You must divide 385 by 760. So pressure in atmospheres equals 385/760.

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MgNH4PO4•6H2O loses H2O in a stepwise fashion as it is heated. Between 40 degrees celsius and 60 degrees celsius, the monohydrat

tino4ka555 [31]

Answer:

$\%\ Composition\ of\ phosphorus=20.00\ \%$

Explanation:

The molecular formula of the monohydrate formed = $MgNH_4PO_4.H_2O$

The molecular mass of the monohydrate formed = $Mass_{Mg}+Mass_{N}+6\times Mass_{H}+5\times Mass_O$

So, Mass = 24 + 14 + 6 × 1 + 5 × 16 = 155 g

Mass of phosphorus = 31 g

Thus,

$\%\ Composition\ of\ phosphorus =\frac{Mass_{phosphorus}}{Total\ mass}\times 100$

$\%\ Composition\ of\ phosphorus=\frac{31}{155}\times 100$

$\%\ Composition\ of\ phosphorus=20.00\ \%$

4 0

3 years ago

If 0.025 gram of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting solution, in parts per m

anastassius [24]

Answer:

249.94ppm

Explanation:

Given parameters:

Mass of Pb(NO₃)₂ = 0.025g

Mass of water = 100g

Unknown:

Concentration of solution in ppm = ?

Solution:

Concentration in parts per million gives the amount of solute found in a million units of the solution. They are desirable for expressing very small amount of solutes in a large solution. For example, the level of arsenic in the soil.

Concentration in ppm = $\frac{amount of solute}{amount of solution} x 10^{6}$

A solution is made up of solute and solvent. The solvent here is water.

mass of solution = mass of solute + mass of solvent = 0.025 + 100 = 100.025g

Concentration in ppm = $\frac{0.025}{100.025} x 10^{6}$ = 249.94ppm

4 0

4 years ago

The reaction given below is in equilibrium.

skad [1K]

Answer:

not sure o. increasing pressure and decreasing temperature

4 0

3 years ago

A physical property can be _________. A. altered with a physical change. B. used to change the identity of a substance. C. obser

vazorg [7]

Answer:

It is C. observed using the 5 senses.

Explanation:

you can observe a substance without changing its identity.

5 0

3 years ago

How do you think you results would be affected if using K2Cr2O7/H2SO4 as the oxidizing agent instead of KMnO4

makkiz [27]

Answer:

Due to weak oxidizing agent.

Explanation:

In my opinion the results would be affected if using K2Cr2O7/H2SO4 as the oxidizing agent instead of KMnO4 because K2Cr2O7/H2SO4 is weak oxidizing agent as compared to KMnO4. An oxidizing agent is a substance that has the ability to oxidize other substances means that accept their electrons so that's why the results of strong oxidizing agent is different than weak oxidizing agent.

3 0

3 years ago