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3 years ago

HELP ASAP PLS AHHH ty

Chemistry

2 answers:

padilas [110]3 years ago

7 0

Answer:

A: Main sequence star.

B: White Dwarf.

C: Black hole.

Explanation:

Brainliest please.

Flauer [41]3 years ago

5 0

Answer: a for the first one , d for the second one, b for the third one.

Explanation:

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Answer : The mass of helium added to the cylinder was, 1.5 grams

Explanation :

Avogadro's law : It is defined as the volume of gas is directly proportional to the number of moles of gas at constant pressure and temperature.

$V\propto n$

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$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

where,

$V_1$ = initial volume of gas = 2.00 L

$V_2$ = final volume of gas = 3.50 L

$n_1$ = initial moles of gas = $\frac{\text{Mass of He}}{\text{Molar mass of He}}=\frac{2.00g}{4g/mol}=0.5mol$

$n_2$ = final temperature of gas = ?

Now put all the given values in the above equation, we get:

$\frac{2.00L}{0.5mol}=\frac{3.50L}{n_2}$

$n_2=0.875mol$

Now we have to calculate the mass of helium were added to the cylinder.

$\text{Mass of He}=\text{Moles of He}\times \text{Molar mass of He}$

$\text{Mass of He}=0.875mol\times 4g/mol=3.5g$

Mass of helium added = 3.5 - 2.00 = 1.5 g

Thus, the mass of helium added to the cylinder was, 1.5 grams

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3 years ago