M (FeCl₃·6H₂O)

• Fe: 55,85
• Cl₃: 35,45 × 3 = 106,35
• 6H₂O: 6 × 18 = 108

→ M = 55,85 + 106,35 + 108 = 270,2 g/mol

M (FeCl₃)

FeCl₃ = 55,85 + 106,35 = 162,2 g/mol

→ Tỉ lệ FeCl₃ trong FeCl₃·6H₂O:

\(\frac{162 , 2}{270 , 2} \approx 0 , 600\)

→ Trong 91,8 g muối ngậm nước có:

\(m_{\text{FeCl}_{3}} = 91 , 8 \times 0 , 600 \approx 55 , 08 \&\text{nbsp};\text{g}\)

Bước 2: Tính nồng độ phần trăm dung dịch

Khối lượng dung dịch bão hòa:

\(m_{\text{dd}} = 91 , 8 + 100 = 191 , 8 \&\text{nbsp};\text{g}\)

Nồng độ % FeCl₃:

\(C \% = \frac{55 , 08}{191 , 8} \times 100 \approx 28 , 7 \%\)

Kết quả: Nồng độ phần trăm của dung dịch FeCl₃ bão hòa ở 20°C là khoảng 28,7%.

(1)Mg + 2HCl → MgCl₂ + H₂↑

(2)MgCl₂ + 2NaOH → Mg(OH)₂↓ + 2NaCl

(3)Mg(OH)₂ →(to) MgO + H₂O

(4)MgO + H₂SO₄ → MgSO₄ + H₂O

(1)Mg + 2HCl → MgCl₂ + H₂↑

(2)MgCl₂ + 2NaOH → Mg(OH)₂↓ + 2NaCl

(3)Mg(OH)₂ →(to) MgO + H₂O

(4)MgO + H₂SO₄ → MgSO₄ + H₂O

Phương trình phản ứng:

C6H1206 ym 2C2H,0Н + 2C0z

Trong 1 lít rượu 40°

có chứa 400 mL ethanol nguyên chất.

→ Methanol = 0, 8.400 = 320 gam

320

160

→ Nethanol

mol

1460 T0o

1600

→ Iglucose

- mol

45

207

→ Mglucose

207 •180 = 1391,3 gam.

Khi đặt hỗn hợp Y trong điện trường ở pH = 6:

• Glu tồn tại ở dạng ion âm (-OOC-CH2-CH2
• CH(NH3+) -COO-

) nên di chuyển về phía cực dương.

• Lys tồn tại ở dạng ion dương (+H3N-CH2-CH2
• CH2-CH2-CH(NH3+)-COO-) nên di chuyển về phía cực âm.
• Gly tồn tại ở dạng ion lưỡng cực (+H3N-CH2
• COO-) nên không di chuyển về phía các điện cực.

Các đồng phân ester của C4H802:

1. HCOO-CH2-CH2-CH3 có tên gọi là propyl formate.
2. HCOO-CH(CH3)2

có tên gọi là isopropyl formate.

1. CH3COO-CH2-CH3 có tên gọi là ethyl acetate.
2. СН3CH2COO-CH3 có tên gọi là methyl propionate.

n recent years, it has become increasingly common for young Vietnamese people to embrace foreign celebrations such as Christmas and Halloween. While some regard this as a harmless trend reflecting global integration, others express concern that such practices may erode traditional cultural values. Personally, I believe that although there are certain risks, the adoption of international festivals can be largely beneficial if approached with cultural awareness and balance.

On the one hand, critics argue that the growing popularity of Western festivals could gradually dilute Vietnam’s cultural identity. Many traditional celebrations such as Tết Nguyên Đán or Mid-Autumn Festival are deeply rooted in historical and spiritual significance. If these events are overshadowed by foreign holidays, particularly among the younger generation, there is a legitimate fear that essential aspects of national heritage may be neglected or forgotten. Furthermore, the commercialisation of festivals like Halloween, which often centres on costumes and consumerism, may promote superficial engagement rather than meaningful cultural exchange.

However, from a more progressive perspective, participating in global festivities can foster cultural openness and enhance social cohesion in an increasingly interconnected world. Young people today are exposed to a variety of cultural influences through media, education, and travel. Celebrating events like Christmas or Halloween offers opportunities to learn about other traditions, practice creativity, and build a sense of global citizenship. Moreover, many Vietnamese youths do not view these celebrations as a replacement for their own culture, but rather as an additional layer that enriches their social experiences.

Importantly, the integration of foreign elements does not necessarily entail the abandonment of local customs. On the contrary, the coexistence of multiple cultural practices can lead to a more dynamic and inclusive society. What matters most is promoting awareness and respect for Vietnamese heritage while allowing space for cultural diversity to flourish.

In conclusion, although concerns about cultural erosion are not unfounded, I believe that the celebration of foreign festivals by Vietnamese youth reflects a natural outcome of globalisation. As long as traditional values are preserved and actively promoted, there is no inherent harm in embracing global cultural practices.