Answer:
option c
Explanation:
as catalyst increases the reaction while activation energy is inversely proportional to rate of reaction, so option c is correct
Answer:
10.2 mg
Explanation:
Step 1: Calculate the total amount of water she drank
1 year has 365 days and she lived in Chicago for 2 years = 2 × 365 days = 730 days.
If she drank 1.4 L of water per day, the total amount of water she drank is:
730 day × 1.4 L/day = 1022 L
Step 2: Calculate the amount of Pb in 1022 L of water
The concentration of Pb is 10 ppb (10 μg/L).
1022 L × 10 μg/L = 10220 μg
Step 3: Convert 10220 μg to milligrams
We will use the conversion factor 1 mg = 1000 μg.
10220 μg × 1 mg/1000 μg = 10.2 mg
Answer:
Electrons are negatively charged particles that orbits the nucleus
Explanation:
Chemical and physical properties of elements are usually determined by the number of electrons they posses. When atoms combine, they do so in order to attain stability.
Answer:
Option A and C
Explanation:
Generally yield of wheat and rice crop is measured in terms of hundredweight. It is also known as centum weight or quintal. one quintal is equal to 100 Kg. It is used primarily in United States of America and British reign. In India quintal is used to measure the yield of wheat and rice
Hence, option A and C is the correct answer
Answer:
256 g
Step-by-step explanation:
a) Balanced equation
We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 2.016 32.00 18.02
2H₂ + O₂ ⟶ 2H₂O
m/g: 32.3 288
(b) Moles of H₂O
n = 288 g H₂O × (1 mol H₂O/18.02 g H₂O)
= 15.98 mol H₂O
(c) Moles of O₂
The molar ratio is (2 mol H₂O /1 mol O₂)
n = 15.98 mol H₂O × (1 mol O₂ /2 mol H₂O)
= 7.991 mol O₂
(d) Mass of O₂
m = 7.991 mol O₂× (32.00 g O₂/1 mol O₂)
= 256 g O₂
The reaction requires 256 g O₂.
<em>Note</em>: If you base your answer on the mass of <em>hydrogen</em>, you get the same result.
Mass of O₂ = 32.3 g H₂ × 1 mol H₂/2.016 g H₂
= 16.02 mol H₂ × 1 mol O₂ /2 mol H₂
= 8.011 mol O₂ × 32.00 g O₂/1 mol O₂
= 256 g O₂
