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2 years ago

Besides filament-based detectors, what else are sometimes used to find flammable liquids?

Chemistry

1 answer:

Anettt [7]2 years ago

6 0

Answer:

Explanation:

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Can someone help me out with this?

ycow [4]

Answer:

2.8 * 10^(-6) / 1.4 * 10^(-2)=

2* 10^(-8)

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3 years ago

What are alternative periodic tables

aksik [14]

Tabulations of chemical elements differing in their organization from the traditional seen periodic system

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2 years ago

State what happens to the potential energy of a the substance during the interval BC *

Ratling [72]

Answer:

The potential energy decreases whereas the kinetic energy increases.

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2 years ago

Calculate the molecular weight of a substance. In which the solution of this substance in the water has a concentration of 7 per

Eduardwww [97]

Answer : The molecular weight of a substance is 157.3 g/mol

Explanation :

As we are given that 7 % by weight that means 7 grams of solute present in 100 grams of solution.

Mass of solute = 7 g

Mass of solution = 100 g

Mass of solvent = 100 - 7 = 93 g

Formula used :

$\Delta T_f=i\times K_f\times m\\\\T_f^o-T_f=k_f\times\frac{\text{Mass of substance(solute)}\times 1000}{\text{Molar mass of substance(solute)}\times \text{Mass of water(solvent)}}$

where,

$\Delta T_f$ = change in freezing point

$T_f^o$ = temperature of pure water = $0^oC$

$T_f$ = temperature of solution = $-0.89^oC$

$K_f$ = freezing point constant of water = $1.86^oC/m$

m = molality

Now put all the given values in this formula, we get

$(0-(-0.89))^oC=1.86^oC/m\times \frac{7g\times 1000}{\text{Molar mass of substance(solute)}\times 93g}$

$\text{Molar mass of substance(solute)}=157.3g/mol$

Therefore, the molecular weight of a substance is 157.3 g/mol

7 0

3 years ago

What 100 plus 124000

kodGreya [7K]

100 + 124000 = 124100

6 0

3 years ago

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