Answer:
The answer to your question is below
Explanation:
1.-
a) Look for the mass number of Gold in the periodic table
Mass number = 197 g
Use proportions to answer this question
197 g of gold ------------- 6.023 x 10 ²³ atoms
4.64 g of gold ---------- x
x = (4.64 x 6.023 x 10²³) / 197
x = 1.42 x 10²² atoms
2.- mass of 4.12 x 10²⁴ molecules of glucose
Molecular mass = (6 x 12) + (12 X 1) + (6 x 16)
= 72 + 12 + 96
= 180 g
180 g of glucose ------------------- 6.023 x 10 ²³ molecules
x ------------------- 4.12 x 10 ²⁴ molecules
x = (4.12 x 10²⁴ x 180) / 6.023 x 10²³
x = 1231.3 g of glucose
CaCl2 + H2O are produced when HCl react with Ca(OH)2
Explanation
equation for reaction is as follows
Ca(OH)2 + 2HCl → CaCl2 +2H2O
1 mole of calcium hydroxide (Ca(OH)2 reacted with 2 moles of hydrochroric acid (HCl) to form 1 moles of calcium chloride CaCl2 and water H2O. This type of reaction is known as neutralization reaction since it between an acid (HCl) and a base (Ca(OH)2
The answer is D
Sodium loses an Electron and chlorine gains one
Answer:
7.1 mL
Explanation:
Step 1: Given data
Moles of methyl benzoate (n): 0.057 mol
Molar mass of methyl benzoate (M): 136.15 g/mol
Density of methyl benzoate (ρ): 1.094 g/mL
Step 2: Calculate the mass corresponding to 0.057 moles of methyl benzoate
We will use the following expression.
m = n × M = 0.057 mol × 136.15 g/mol = 7.8 g
Step 3: Calculate the volume corresponding to 7.8 g of methyl benzoate
We will use the density formula.
ρ = m/V
V = m/ρ
V = 7.8 g/1.094 g/mL
V = 7.1 mL
