Based on science 4) 1) 0.25M
2) 0.66M
3) 1.5M
4) 4.0M ––> Therefore, this is the most concentrated
5) 30g NaOH(1 mol NaOH / 40gNaOH) = 0.75 mol NaOH / 0.500L = 1.5M NaOH (3)
6) 1) 1.0 mol / L(1 L) = 1 mol H2SO4
2) 1 mol / L (2 L) = 2 mol H2SO4
3) 0.50 mol / L ( 1.0L) = 0.50 mol H2SO4 ––>
7) 0.200 mol / L (1 L)(74.6g / mol) = 14.92g (2)
8) 0.25 mol / 0.250 L = 1 mol / L = 1M (1)
This is the answer : 1m
When you need heat to make reaction happen it is endothermic.
If heat was on the right side then type of reaction would be exothermic.
Answer:
Hello!!! Princess Sakura here ^^
Explanation:
The precipitate forms when one of the compounds is insoluble. In double replacement reactions, the positive ions and the negative ions are dissolved reactants that switch places to form the precipitation reaction.
- The atomic mass of carbon is 12.011 g/mol.
- The atomic mass of hydrogen is 1.00794 g/mol.
This means the molar mass of CH is
Dividing the given molar mass by this,
This means the molecular formula is 
Ans: 15.1 grams
Given reaction:
Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3
Mass of Na2CO3 = 20.0 g
Molar mass of Na2CO3 = 105.985 g/mol
# moles of Na2CO3 = 20/105.985 = 0.1887 moles
Based on the reaction stoichiometry: 1 mole of Na2CO3 produces 2 moles of NaOH
# moles of NaOH produced = 0.1887*2 = 0.3774 moles
Molar mass of NaOH = 22.989 + 15.999 + 1.008 = 39.996 g/mol
Mass of NaOH produced = 0.3774*39.996 = 15.09 grams
