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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} $ ?
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