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2 years ago

Write number then solution!!!!!!!!!!!

Chemistry

2 answers:

vivado [14]2 years ago

7 0

Answer:

1- waxing gibbous

2- third quarter

3- waxing crescent

4- full moon

5- waning crescent

6- new moon

7- first quarter

8- waning gibbous

Explanation:

hope that helps

Zielflug [23.3K]2 years ago

6 0

Pain and suffering

Pain and suffering

Pain and suffering

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zlopas [31]

Answer:

A is the answer. Ca(calcium) is an element, O2 is a diatomic element, and NaCl is a compound composed of Na(sodium) and Cl(chlorine)

Explanation:

hopefully that helps!!!

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2 years ago

A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

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Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

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3 years ago

How many mg of O2 will react with the TNT?

Tanzania [10]

TNT has the molecular formula: C7H5N3O6. And hence, when reacted in oxygen gas, you get what is known as combustion reaction. the reaction is: C7H5N3O6+O2→CO2+N2+H2O

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