How much sodium hydroxide is required to make 250 cm...
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
10.0 g
4.0g
2.0 g
1.0g
0.1 g
Correct answer is D
no of moles of Na = molar concentration X volume
= 0.1 x 2501000 = 0.025
no of moles = mM
mass = no of mles x molar mass = 0.025 x 40 = 1.0g ( molar mass of NaOH = 40g/mol)
Which of the following halogens is the most reactive?...
Which of the following elements would produce coloured ions in aqueous solution? ...
Which of the following factors would not affect the solubility of a gas? ...
The boiling point of water is higher than the boiling point of ethanol because ...
In the reaction H2(g)O → H2(g) + 1/2O2(g) ΔH = -2436000 KJ, which of the following has no ...
Which of the following sources of energy contributes to green-house effect? ...
Which of the following separation is routinely applied in the petroleum industry ...