CHEMICAL QUANTITIES AND RATE OF REA Multiple choice questions: 10. Which quantit
ID: 1084907 • Letter: C
Question
CHEMICAL QUANTITIES AND RATE OF REA Multiple choice questions: 10. Which quantity best describe the formula "N27 1. 2 grams of atoms 2. 2 moles of atoms 3. 1 Liter of atoms 4. 1 mole of atoms How many different types of atoms are present in the formula (NH.):HPO. 1) 2 2)4 3) 5 4) 16 12. What is the total number of atoms in one mole of MgtCIOla? 1) 13 2)3 3) 8 4) 11 13. How many moles of hydrogen atoms are there in 2.5 moles of (NHal.CO, SHO 2) 8 2) 32.5 3)45 4) 37.5 14. What is the mass of one mole of gold? 1) 11g 2) 79 g 3) 197g 4) 80 g 15. What is the molar mass of Ba(OH)2. 8H20? 1) 452 g/mol 2) 187 g/mol 3) 242 g 4) 315 g 16. In the reaction: What is the mole ratio of Fe Os to Fe in the reaction? 2) 3:1 3) 1:2 4)2:3 17. Given the reaction: CsH8 + 502 > 3CO2 + 4H2O How many moles of oxygen are required to produce 1.5 moles of CO2? 1) 1.5 2) 2.5 3) 3.0 4) 5.0Explanation / Answer
10.
N2 represents 1 mole of N2 molecules and each molecule consists of 2 atoms. So we ca represent best as 2 moles of N atoms.
Answer : 2
11.
the given formula is (NH4)2HPO4
in the formula
N represents Nitrogen atom, H represents Hydrogen atom, P represents Phosphorous atm anf O represents Oxigen atom. so there are totally four different atoms are there.
Answer : 2
12.
Mg(ClO4)2 -------> Mg atom + 2 Cl atoms + 8 O atoms
1 molecule will give totally 11 atoms,
1 mole of Mg(ClO4)2 will give 11 moles of atoms.
Answer : 4
13.
The given formula is (NH4)2CO3.5H2O
1 molecule of (NH4)2CO3.5H2O contains 18 H atoms( 8 from (NH4)2CO3 and 10 from 5H2O)
1 mole of (NH4)2CO3.5H2O contains 18 moles of H atoms
2.5 moles of (NH4)2CO3.5H2O contains 18 * 2.5 moles of H atoms = 45 moles of H atoms.
Answer : 3
15.
Given compound = Ba(OH)2*8H2O
Molar mass = 1 * molar mass of Ba + 2 *(molar mass of O + molar mass of H) + 8*(2*molar mass of H + 1* molar mass of O)
Molar mass = 1*137 + 2(16+1) + 8 (2*1+1*16) = 315g/mol
Answer = 4
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