3 years ago

As long as a substance ________, it is considered a physical change.

Chemistry

1 answer:

-BARSIC- [3]3 years ago

7 0

Answer:

as long as a substance becomes a new substance it will be considered a physical change

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3 years ago

What is the mass of one mole of hydrogen molecules?

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Answer:

2 grams

Explanation:

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How many moles of oxygen will occupy a volume of 2.50 liters?

loris [4]

Data:
n (number of mols) = ?
V (volume) = 2.50 Liters
If:
1 L → 1000 g
2.50 L → y

y = 1000*2.50 = 2500 g

Therefore:
m (mass) = 2500 g

Now:
Molar Mass (MM) of oxygen = 16 g/mol

Formula:
$n = \frac{m}{MM}$

Solving:
$n = \frac{m}{MM}$
$n = \frac{2500\:\diagup\!\!\!\!\!g}{16\:\diagup\!\!\!\!\!g/mol}$
$\boxed{\boxed{n = 156.25\:mols}}\end{array}}\qquad\quad\checkmark$

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