Atomic size gradually decreases from left to right across a period of elements.
Answer:
C4H4O
Explanation:
1.24 g x 1mol/(44)g = 0.03mol C;
Mass of C: 0.03mol x 12.g/1mol
= 0.36g of C
mol of H: 0.255g x 1mol /(18) x2= 0.028mol
Mass of H; = 0.028g × 1 of H
Mass of O: 0.519 g – (0.36g +0.028g)= 0.131g;
0.131g/16 =0.008 mol
Divide by the smallest number of moles;
0.028/0.008 mol = 3.5; 0.03/0.008 mol =3.75, 0.008 mol/0.008 mol =1
C4H4O
Answer: 462.00 Joules of heat will be needed to change the temperature of copper from 20° C to 60° C.
Explanation:
Mass of copper,m = 30.0 grams
Specific heat capacity of copper,c = ![0.385 J/g ^oC](https://tex.z-dn.net/?f=0.385%20J%2Fg%20%5EoC)
![T_1=20^oC,T_2=60^oC](https://tex.z-dn.net/?f=T_1%3D20%5EoC%2CT_2%3D60%5EoC)
![\Delta T=T_2-T_1=60^oC-20^oC=40^oC](https://tex.z-dn.net/?f=%5CDelta%20T%3DT_2-T_1%3D60%5EoC-20%5EoC%3D40%5EoC)
![Q=mc\Delta T](https://tex.z-dn.net/?f=Q%3Dmc%5CDelta%20T)
![Q=30.0 grams\times 0.385 J/g ^oC\times 40^oC=462.00 J](https://tex.z-dn.net/?f=Q%3D30.0%20grams%5Ctimes%200.385%20J%2Fg%20%5EoC%5Ctimes%2040%5EoC%3D462.00%20J)
462.00 Joules of heat will be needed to change the temperature of copper from 20° C to 60° C.
The full decimal is 2.59328...
When you round up the answer is 2.6 atoms of Li
Answer:
4.22
Explanation:
pH stands for potential hydrogen. The letter “p” denotes potential and the letter “H” denotes hydrogen.
pH helps to find the acidity or alkalinity of an aqueous solution.
The number of hydrogen ions (protons) present in a solution is determined by the pH scale.
A pH greater than 7 makes the water more alkaline and a pH less than 7 makes the water more acidic.
![pH=-\log [H^+]=-\log [0.00006]=4.22](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5BH%5E%2B%5D%3D-%5Clog%20%5B0.00006%5D%3D4.22)