Answer:
E = 2.15 ×10⁻¹⁷J
Explanation:
Given data:
Wavelength of X-ray = 9.23 nm (9.23×10⁻⁹ m)
Energy of x-ray = ?
Solution:
Formula:
E = hc/λ
h = planks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /9.23×10⁻⁹ m
E = 19.89 ×10⁻²⁶ J.m/9.23×10⁻⁹ m
E = 2.15 ×10⁻¹⁷J
The mass of water produced is 4.70 g.
<em>M</em>_r: 58.12 32.00
2C₄H₁₀ + 13O₂ ⟶ 8CO₂ + 10H₂O
<em>m</em>/g: 3.03
<em>Moles of C₄H₁₀</em> = 3.03 g C₄H₁₀ × (1 mol C₄H₁₀/58.12 g C₄H₁₀) = 0.05 213 mol C₄H₁₀
<em>Moles of H₂O</em> = 0.052 13 mol C₄H₁₀ × (10 mol H₂O/2 mol C₄H₁₀) = 0.2607 mol H₂O
Mass of H₂O = 0.2607 mol H₂O × (18.02 g H₂O/1 mol H₂O) = 4.70 g H₂O
Answer:
Brittany is studying the properties of a sample of iron. Whether she studies a large sample or a small sample, the <u><em>properties</em></u> of iron will always be the same.
Explanation:
The properties of an element will always remain the same no matter if we change the quantity of the element.
Iron is a chemical element with atomic number 26. It belongs to group 8 of the periodic table.
The properties of iron are:
- It is a shiny metal.
- It is soft, malleable and ductile.
- It combines readily with oxygen in the air and hence can be rusty in the damp air.
1 mol Au ---------------- 196.9665 g
0.150 mol Au ----------- ?
0.150 x 196.9665 / 1
= 29.54 g
hope this helps!