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Question
500 mL 0.2M NaOH এর ভর কত ?
2 g
4g
5g
gg
ANSWER : 2
Descrption
<p style="margin-left:0px;">The mass of the NaOH solution can be determined using the following steps:</p><p style="margin-left:0px;"><strong>Identify the relevant information:</strong></p><ul><li>Volume of the solution (V) = 500 mL = 0.5 L (convert milliliters to liters)</li><li>Molarity (M) = 0.2 M</li></ul><p style="margin-left:0px;"><strong>Calculate the moles of NaOH:</strong></p><ul><li>Molarity (M) represents moles of solute per liter of solution.</li><li>Moles of NaOH (mol) = Molarity (M) x Volume (L)</li><li>Moles of NaOH = 0.2 M * 0.5 L = 0.1 mol</li></ul><p style="margin-left:0px;"><strong>However, to find the mass of NaOH (m), we need its molar mass (MM).</strong></p><p style="margin-left:0px;"><strong>Molar mass of NaOH (MM):</strong></p><ul><li>Sodium (Na): 22.99 g/mol</li><li>Oxygen (O): 16.00 g/mol</li><li>Hydrogen (H): 1.01 g/mol</li><li>MM(NaOH) = 22.99 g/mol (Na) + 16.00 g/mol (O) + 1.01 g/mol (H) = 40.00 g/mol</li></ul><p style="margin-left:0px;"><strong>Calculate the mass of NaOH (m):</strong></p><ul><li>Mass (m) = Moles (mol) x Molar mass (MM)</li><li>m(NaOH) = 0.1 mol * 40.00 g/mol = 4.0 g</li></ul><p style="margin-left:0px;">Therefore, the mass of the 500 mL 0.2 M NaOH solution is <strong>4 grams (g)</strong>.</p><p style="margin-left:0px;"><strong>The answer is 4g.</strong></p>
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