Related Questions
Number of molecules in 1 ml of at NTP
molecules
molecules
molecules
molecules
A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:
12
24
36
48
The number of Na atoms in 46 g βNaβ
6.023{\mkern 1mu} {\mkern 1mu} imes {\mkern 1mu} {\mkern 1mu} {10^{23}}
2
1
12.046{\mkern 1mu} {\mkern 1mu} imes {\mkern 1mu} {\mkern 1mu} {10^{23}}
A gaseous mixture contains oxygen and nitrogen in the ratio of by weight. Therefore, the ratio of their number of molecules is:
1:4
7:32
32:7
4:1
Upon heating, 15.0 g of impure zinc carbonate decomposes completely to produce zinc oxide and carbon dioxide. If 5.6 g of zinc oxide is formed, calculate the percentage purity of the zinc carbonate sample. (Atomic weight: )
57.6
65.4
72.8
81.4
Weight of of oxygen at NTP on liquification would be:
Which sample contains the largest number of helium atoms?
0.1 mol of He
0.2 mol of He
0.1 mol of
0.1 mol of
13.5 g aluminium changes to in solution by losing :
electrons
electrons
electrons
electrons
The number of molecules present in 1 mL of gas or vapour at STP is:
Called Loschmidtβs number
Equal to
Both (1) and (2)
None of the above
Which of the following contains the largest number of water molecules?
100 g of water
18 g of ice
0.25 moles of water
100 ml of water vapor at STP
