Filters
Latest Questions
Chemistry
Mole concept
A gaseous mixture of ${H_2}$ ​ and ${N_2}O$ gas contains 66 mass % of ${N_2}O$ . What is the average molecular mass of a mixture?

Chemistry
Mole concept
The atomic mass of potassium is 39.1. What is the mass of $6.022 \times {10^{23}}$ atoms of potassium?

Chemistry
Mole concept
If one atom of an element ‘ $x$ ’ weighs $6.643 \times {10^{ - 23}}G$ . What will be the number of moles in $20Kg$ ?

Chemistry
Mole concept
How many carbon atoms are present in $0.35\;mol$ of ${C_6}{H_{12}}{O_6}$?
(A) $6.023 \times {10^{23}}$ carbon atoms
(B) $1.26 \times {10^{23}}$ carbon atoms
(C) $1.26 \times {10^{24}}$ carbon atoms
(D) $6.023 \times {10^{24}}$ carbon atoms

Chemistry
Mole concept
Which two properties characterize an air mass?

Chemistry
Mole concept
How many grams of urea ( $N{{H}_{2}}CON{{H}_{2}}$ ) are there in 0.01 moles of it?

Chemistry
Mole concept
What mass of magnesium hydroxide is required to neutralize $125ml$ of $0.136M$ of $HCl$ solution?
Molar mass of $Mg{\left( {OH} \right)_2} = 58.33gmo{l^{ - 1}}$
(A) $0.248g$
(B) $0.496g$
(C) $0.992g$
(D) $1.98g$

Chemistry
Mole concept
What is the molar mass of calcium bromide?

Chemistry
Mole concept
How many atoms are present in $49\,g$ of ${H_2}S{O_4}$ ?
A. $7 \times 6.023 \times {10^{23}}$
B. $5 \times 6.023 \times {10^{23}}$
C. $6 \times 6.023 \times {10^{23}}$
D. $7 \times 3.02 \times {10^{23}}$

Chemistry
Mole concept
What is the molar mass of $HCN$ ?

Chemistry
Mole concept
For which compound does $0.256$ mole weigh $12.8g$ ?
(A) ${C_2}{H_4}O$
(B) $C{O_2}$
(C) $C{H_3}Cl$
(D) ${C_2}{H_6}$
Chemistry
Mole concept
Sea water contains around $65{\text{ }} \times {\text{ }}{10^{ - 3}}g{\text{ }}{L^{ - 1}}$ of bromide ions. If all the bromide ions are converted into $B{r_2}$ , then how much sea water is needed to produce $1{\text{ }}kg$ of bromide $B{r_2}$ ?
Prev
1
2
3
4
5