Some Basic Conc...

A solution of ethanol in water is 10% by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly?

$$10g$$ of glucose is dissolved in $$150g$$ of water. The mass percantage of glucose is:

A fresh $$H_2O_2$$ solution is labeled as $$11.2V$$. Calculate its concentration in wt/vol percent.

In a test tube, there is $$18\ g$$ of glucose $$(C_{6}H_{12}O_{6})0.08$$ mole of glucose is taken out. Glucose left in the test tube is:

The mass of $$50\%(w/w)$$ solution of $$HCl$$ required to react with $$100\ g$$ of $$CaCO_{3}$$ would be?

One mole of a mixture of CO and $${ CO }_{ 2 }$$ requires exactly 20 g of NaOH in solution for complete conversion of all the $${ CO }_{ 2 }$$ into $${ Na }_{ 2 }{ CO }_{ 3 }$$. How much NaOH would it require for conversion into $${ Na }_{ 2 }{ CO }_{ 3 }$$, if the mixture (one mole) is completely oxidized to $${ CO }_{ 2 }$$?

Equivalent wt.of a metal is $$2.5$$ times higher than oxygen. The ratio of weight of metal to the oxide is:

$$1.5 gm$$ mixture of $${ SiO }_{ 2 }$$ and $${ Fe }_{ 2 }{ O }_{ 3 }$$ on very strong heating leave a residue weighting $$1.46 gm$$. The reaction responsible for loss of weight is
$${ Fe }_{ 2 }{ O }_{ 3 }(s)\longrightarrow { Fe }_{ 3 }{ O }_{ 4 }(s)+{ O }_{ 2 }(g)$$
What is the percentage by mass of $${ Fe }_{ 2 }{ O }_{ 3 }$$ in original sample?

$$400mg$$ capsule contains $$100mg$$ of ferrous fumarate. The percentage of iron present in the capsule approximately is: (Mol mass of $$Fe({C}_{4}{H}_{2}{O}_{4})=170$$)

The density of a $$3 \,M$$ sodium thiosulphate $$(Na_2S_2O_3)$$ solution is $$1.25 \,gm/ml$$. Calculate the percentage by weight of sodium thiosulphate.