Can some one me with science . i am having a difficult time .
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Ответ:
Kilometer - km - 1,000
Hectameter - hm - 100
Decameter - dam - 10
Millimeter - mm - 0.001
The table provides clear prefix rules.
The prefixes can be used for most (if not all) units such as grams (kg,mg...).
Ответ:
The partial pressure of nitrogen gas is 405.76 mmHg and that of hydrogen gas is 257.24 mmHg
Explanation:
To calculate the number of moles, we use the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}](/tpl/images/0401/9550/fc8e7.png)
For nitrogen gas:Given mass of nitrogen gas = 3.46 g
Molar mass of nitrogen gas = 28 g/mol
Putting values in above equation, we get:
![\text{Moles of nitrogen gas}=\frac{3.46g}{28g/mol}=0.123mol](/tpl/images/0401/9550/4dbe2.png)
For hydrogen gas:Given mass of hydrogen gas = 0.156 g
Molar mass of hydrogen gas = 2 g/mol
Putting values in above equation, we get:
Mole fraction of a gas is calculated by using the formula:
......(1)
For nitrogen gas:Putting values in equation 1, we get:
![\chi_{\text{nitrogen gas}}=\frac{0.123}{0.123+0.078}=0.612](/tpl/images/0401/9550/7a9c3.png)
For hydrogen gas:Putting values in equation 1, we get:
The partial pressure of a gas is given by Raoult's law, which is:
where,
= mole fraction of substance A
For nitrogen gas:![p_{\text{Nitrogen gas}}=663mmHg\times 0.612\\\\p_{\text{Nitrogen gas}}=405.76mmHg](/tpl/images/0401/9550/3c935.png)
For hydrogen gas:Hence, the partial pressure of nitrogen gas is 405.76 mmHg and that of hydrogen gas is 257.24 mmHg