Answer:
Molality of the solution is 0.119 mol/kg
Explanation:
Molality is the type of concentration that indicates the moles of solute in 1 kg of solvent.
As we assume water's density as 1 g/mL, we need to calculate the mass of water (our solvent).
We convert 0.535 L to mL → 0.535 L = 535 mL
By the way, water's mass is 535 g.
We convert the mass from g to kg → 535 g = 0.535kg
We need to calculate the moles of solute, NaCl.
3.71 g . 1mol / 58.45 g = 0.0635 mol
Molality = mol/kg → 0.0635 mol / 0.535kg = 0.119 m
The number of grams of oxygen present in 1.75 moles of calcium carbonate is 84 grams
Explanation
mass = moles x molar mass
molar mass = 16 g/mol
find the number of moles of oxygen in calcium carbonate as below
formula of calcium carbonate is CaCO3
from the formula above have three(3) atoms of oxygen
therefore the moles of 0xygen = 3 x 1.75 =5.25 moles
mass of oxygen is therefore = 5.25 moles x16g/mol = 84 grams of oxygen
Answer;
1 mole
Explanation;
Iodine and hydrogen react according to the following equation to yield hydrogen iodide.
H2(g) + I2(s) = 2HI
Using the mole ratio; the mole ratio of H to I is 1: 1
Thus; 1 mole of hydrogen will require 1 mole of iodine to form 2 moles of hydrogen iodide.
Answer:
Yes, they are real.
Explanation:
Can a human be a biohazard?
Biohazards are any material that can possibly contain infectious diseases. For example, human feces can contain diseases such as C. diff, Hepatitis A and E, Giardia, E coli, Cholera, and Norovirus so, yes, human feces are a biohazard.
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