Some Basic Conc...

What is the % of acetic acid present in vinegar?

10 grams of a solute is dissolved in 90 grams of a solvent. Its mass percent in solution is

1 amu is equal to

Which of the following reactions is not according to the law of conservation of mass?

The accepted unit of atomic and molecular mass is:

What is atomic mass of $$He$$ in amu $$(u)$$ units?

When $$2.5\,g$$ of a sample of Mohr's salt reacts completely with $$50\,mL $$ of $$ \dfrac{N}{10} KMnO_4 $$ solution. The % purity of the sample of Mohr's salt is:

What percentage ox oxygen is present in the compound $$CaCO_3. 3Ca_3(PO_4)_2 $$?

$$2.0\,g$$ sample contain mixture of $$SiO_{2}$$ and $$Fe_{2}O_{3}$$ , on very strong heating leave a residue weighing $$1.96\,g$$ . The reaction responsible for loss of weight is 
$$ Fe_{2}O_{3} (s) \rightarrow Fe_{3}O_{4} (s) + O_{2} (g) $$ (unbalanced equation)
what is the percentage of mass of $$SiO_{2}$$  in original sample?