Strength of a Solution in Different Units

Amount of Oxalic acid ${\left(\mathrm{COOH}\right)}_2.2{\mathrm{H}}_2\mathrm{O}$, in grams required to prepare $200 \mathrm{mL}$ of $0.5 \mathrm{M}$ oxalic acid solution is _____.

Amount of Oxalic acid ${\left(\mathrm{COOH}\right)}_2.2{\mathrm{H}}_2\mathrm{O}$, in grams required to prepare $200 \mathrm{mL}$ of $0.5 \mathrm{M}$ oxalic acid solution is _____.

Amount of Oxalic acid ${\left(\mathrm{COOH}\right)}_2.2{\mathrm{H}}_2\mathrm{O}$, in grams required to prepare $200 \mathrm{mL}$ of $0.5 \mathrm{M}$ oxalic acid solution is _____ $\mathrm{g}$.($12.6$/$1.26$)

How many moles of solute particles are present in one litre of ${10}^{-4} \mathrm{M}$ potassium sulphate? (assume ${\mathrm{K}}_2{\mathrm{SO}}_4$ does not dissociate.)

$\left(0.0001 / 0.001 / 0.01\right)$

Calculate the molarity of a solution of ethanol in water, in which the mole fraction of ethanol is $0.040$.
(Assume the density of water to be one).
(Provide correct answer upto $2$ decimal places and no need to mention units.)

During acidity, $\mathrm{HCl}$ concentration in the stomach rises from a normal of $8\times {10}^{-2} \mathrm{M}$ to $0.1\mathrm{M} \mathrm{HCl}$. One rolaid tablet contains $500 \mathrm{mg}$ of the active component. What percentage of the tablet should be sufficient to return the molarity to normal if the stomach contains $500 \mathrm{ml}$ of the acid?

$3 \mathrm{g}$ of salt of molecular mass $30$ is dissolved in $250 \mathrm{mL}$ of water. The molarity of the solution is _____$\mathrm{mol}/\mathrm{L}$. $\left(0.4/0.04/0.1\right)$

$3 \mathrm{g}$ of a salt of molecular mass is $30$. $250 \mathrm{ml}$ is dissolved in $250 \mathrm{ml}$ of water. The molarity of the solution is _____.

Calculate the molarity of the following solution- 30 g of Co(NO₃)₂. 6H₂O in 4.3 L of solution. And report your final answer by multiplying it with 10000.

Which of the following is/are correct for 17 g/L of H₂O₂ solution ?