Answer:
A
Explanation:
When a reaction happens some of the reactants mass is released as energy so the mass of the product would be less
Answer:
Una partícula subatómica es aquella que es más pequeña que el átomo. Puede ser una partícula elemental o una compuesta, a su vez, por otras partículas, como los quarks que componen los protones y los neutrones. ... De esta manera, se han descubierto docenas de partículas subatómicas, y se teorizan cientos de otras más.
Since we are not given how the atoms are packed whether it is face centered or body centered we just assume that the atoms are just packed in a cubic manner in a sense that the atoms fills a cube. Calculations are as follows:
Volume of an atom = 4/3 πr³ = π/6 (d³) = π/6 (10^-10)³ = 5.24 x 10^-31 m³
Number of atoms = 1 cm³(1 m³ / 100³ m³) / <span>5.24 x 10^-31 m³ = 1.91 x 20^24 atoms</span>
Answer:
0.04838J
Explanation:
Heat is a form of energy that is transferred from one body to another as the result of a difference in temperature between the bodies , here heat is added to the water as a result of temperature change of 0.364 degreesC
Given:change in temperature=0.364
Mass of water=0.0318g
But we need specific heat capacity of water which is
4.2 J/g°C
Then we can calculate How much heat is added by using below formula
Energy = Mass * specific heat capacity *(change in temperature)
energy =0.0318g* 4.18g*0.364
=0.04838J
Answer : The mass of sodium sulfate needed is 5.7085 grams.
Explanation : Given,
Concentration of sodium ion = 0.148 mol/L
Volume of solution = 2.29 L
Molar mass of sodium sulfate = 142 g/mole
First we have to determine the moles of sodium ion.
Now we have to calculate the moles of sodium sulfate.
The balanced chemical reaction will be,
As, 2 moles of sodium ion produced from 1 moles of 
So, 0.08035 moles of sodium ion produced from 
moles of
Now we have to calculate the mass of sodium sulfate.
Therefore, the mass of sodium sulfate needed is 5.7085 grams.
