Some Basic Conc...

The amount of water obtained from combustion of $$16 grams$$ of methane is_______

Our body contains ___________ of water by weight.

The percentage weight by weight of $$0.5$$M $$CCl_4$$ solution in benzene is?
(Density of solution = $$1.4$$g/ml)

If mass percentage of $$Mg^{2+}$$ in a biomolecule is 0.2%, then the number of $$Mg^{2+}$$ ions present in 10 g of biomolecule is (Atomic weight of Mg = 24)

$$H_2SO_4$$ is $$98\%$$ by weight of solution .Hence it is ?

What is the proportion by weight the constitution elements of $$Cu$$ and $$O$$ in the compound $$CuO$$?

Suppose 30% molecules have M = 20000; 40% molecules have M= 30000, rest of them have M=60000. then the PDI is :

200 gram of a solution of water and sugar contains 20 g solute. What is the concentration of the solution in mass percentage?

How many grams of concentrated sulphuric acid $$ (80\%W/W) $$ sould be used to prepare 100 mL of one molar $$H_{2}SO_{4}$$ solution?

$$40$$% of  a mixture of $$0.2mol$$ of $${N}_{2}$$ and $$0.6mol$$ of $${H}_{2}$$ reacts to give $${NH}_{3}$$ according to the equation:
$${N}_{2}(g)+3{H}_{2}(g)\rightleftharpoons  2{NH}_{3}(g)$$
at constant temperature and pressure. Then the ratio of the final volume to the initial volume of gases are