Answer:
2.107×10²⁴
Explanation:
no of moles=no of particles/Avogadro's number
3.5=X/6.02×10²³
by cross multiplication
3.5×6.02×10²³
=2.107 ×10²⁴
<h3>
Answer:</h3>
56.25 mL
<h3>
Explanation:</h3>
We are given;
Molarity of Na₂CO₃ = 1.50 M
Mass of Na₂CO₃ = 3.975 g
We are required to calculate the volume of Na₂CO₃
Step by step explanation:
<h3>Step 1: Determining moles of Na₂CO₃</h3>
Molar mass of Na₂CO₃ = 106 g/mol
But; moles = Mass ÷ molar mass
Therefore;
Moles of Na₂CO₃ = 3.975 g ÷ 106 g/mol
= 0.0375 moles
<h3>Step 2: Calculating the volume of Na₂CO₃</h3>
Relationship between volume, moles and molarity is given by;
Molarity = Moles ÷ Volume
Thus;
Volume = moles ÷ Molarity
= 0.0375 mole × 1.5 M
= 0.05625 L
But; 1 L = 1000 mL
Therefore; Volume = 56.25 mL
Hence, the volume of Na₂CO₃ is 56.25 mL
Well for the paper clips, she could use magnets to get them out... Then with the salt and the gravel , she could just pick up the gravel, then sweep the salt into another pile.... idk if this was what you're looking for but it is realistic.
Answer:
because u need one more assianment before it becomes 100
Explanation:
Enthalpy change is the total heat that is absorbed or evolved in a certain reaction that is being carried in a constant pressure system. It can be calculated by the product of the specific heat of the substance ad the difference of the final temperature and the initial temperature. Molar enthalpy change is the heat evolved or absorbed per 1 mole of a substance.The specific heat of water is 4.18 J per gram of water per degree Celsius. We calculate as follows:
Molar enthalpy change = 4.18 J / g - C ( 76.2 C - 41.7 C ) ( 18.02 g / mol ) = 2598.6642 J or 2.6 kJ
