Advertisements
Advertisements
प्रश्न
Which of the following would weigh the highest?
विकल्प
0.2 mole of sucrose (C12 H22 O11)
2 moles of CO2
2 moles of CaCO3
10 moles of H2O
उत्तर
2 moles of CaCO3
Weight = Numberpf moles × molar mass.
0.2 mole of sucrose (C12H22O11)
= 0.2 × 342
= 68.4 g
2 moles of CO2 = 2 × 44 = 88 g
2 moles of CaCO3 = 2 ×100 = 200 g
10 moles of H2O = 10 × 18 = 180 g
APPEARS IN
संबंधित प्रश्न
A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
State what a chemical formula denotes.
State the type of element for the following:
Phosphorus
State the type of element for the following:
Bromine
Give the symbol of the following element:
Nitrate
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Nitrate
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Sulphite
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
The pictorial symbol for water given by the alchemists was
