Answer:
unlike scientific data, promotional material is aimed at selling products, not at learning more about the natural world.
Explanation
.Someone with critical thinking skills can judge what pieces of information are important and discard data that is not useful to him. He can weigh various facts and points of view and identify logical errors
Answer:
ans .4
Explanation:
SiO2 +HF ⇒ SiF4 +H2O
reactant side product side
Si = 1 Si = 1 its balanced
O = 2 O = 1 (× WITH 2 ) we got O =2 And H = 4
H = 1 H = 2 NOW H =4
F= 1 (×4) F = 4
now we get SiO2 +4 HF ⇒SiF4 +2 H2O
After multiply with number again check it. Si = 1, O = 2 ,H=4 ,F=4
Answer:
3.1 moles of ammonia
18.67× 10²³ molecules
Mass = 52.7 g
Explanation:
Given data:
Number of atoms of hydrogen = 5.68×10²⁴ atoms
A) Number of molecules of ammonia = ?
Solution:
First of all we will calculate the number of moles of hydrogen.
1 mole = 6.022× 10²³ atoms
5.68×10²⁴ atoms × 1 mol / 6.022× 10²³ atoms
0.94×10¹ mol
9.4 moles of hydrogen
Moles of ammonia:
3 moles of hydrogen are present in one mole of ammonia.
9.4 moles of hydrogen = 1/3×9.4 =
3.1 moles of ammonia
Number of molecules of ammonia:
1 mole contain 6.022× 10²³ molecules.
3.1 mol × 6.022× 10²³ molecules / 1 mol
18.67× 10²³ molecules
c) Mass of sample = ?
Mass = number of moles × molar mass
Mass = 3.1 moles × 17 g/mol
Mass = 52.7 g
Answer:
The answer to your question is
Explanation:
Question 8
To find the mass of a compound if we have the number of moles, we must use the molar mass of that compound (g/mol) and use proportions or a rule of three to find the mass.
Solution: g/mol of Calcium carbonate
Question 9
Use a rule of three to find the answer
1 mol ------------------ 22.4 L
0.98 moles ---------- x
x = (0.98 x 22.4) / 1
x = 21.952 L ≈ 22 L
Solution: 22 L