Answer:
You need 4 moles of HCl to produce two moles of H2
Explanation:
You can simplify mole and 2 mole into 1 and 2
So how many HCl do you need to make H2?
There are one Hydrogen molecule in Hcl And you need 2 to make a H2
And to make two of each you need to multiply 2 by 2 which is 4
So you need 4 moles of HCl to produce two moles of H2
Hope this helps!
Hvap, Tvap, Mr are constants
Hvap = 443.38 kJ/kg = 196417.34 J/mol
Tvap = -85.1 °C
Mr = 36.5 g/mol
n = 1.80 mol
ΔS = n*Hvap/Tvap
ΔS = 1.80 * 196417.34 / (273-85.1)
ΔS = 1881.59 J/K = 1.882 kJ/K
Answer:
3.98g
Explanation:
Given parameters:
Number of molecules = 1.2 x 10²⁴ molecules
Unknown:
Mass of H₂ = ?
Solution:
To find the mass of this molecule, we use the expression below:
Mass = number of moles x molar mass
Molar mass of H₂ = 2(1) = 2g/mol
6.02 x 10²³ molecules are contained in 1 mole of a substance
So; 1.2 x 10²⁴ molecules will have 
= 1.99 moles of H₂
Mass of H₂ = 1.99 x 2 = 3.98g
Answer: The correct answer is C) carbon dioxide; calcium.
Explanation:
Carbonated soft drinks contain big concentrations of carbon dioxide, which is the bubbles that we see and feel. When these drinks are included regurly in the diet, the carbon dioxide levels are increased; and according to several studies high carbon dioxide values are related with bone loss.
Additionally, calcium is known for being an important nutrient for both formation and maintenance of bones, so inadequate intake of calcium in the diet results in a bone loss.
Answer:
HCl- polar, soluble in water
O2- nonpolar, insoluble in water
CaCl2- ionic, soluble in water
N2- nonpolar, insoluble in water
KNO3- ionic, soluble in water
BeCl2- nonpolar, insoluble in water
BCl3- nonpolar, insoluble in water
Explanation:
Ionic and polar substances are soluble in water while nonpolar substances are not soluble in water. Solubility in water has to do with dipole interaction with hydrogen and hydroxide ions which is possible only for ionic and polar substances as shown in the answers above.
