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Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.
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| name | chemical-mass-percent-calculation |
| description | Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions. |
| license | MIT license |
| metadata | {"skill-author":"PJLab"} |
import asyncio
import json
from contextlib import AsyncExitStack
from mcp.client.streamable_http import streamablehttp_client
from mcp import ClientSession
class ChemistryClient:
def __init__(self, server_url: str, api_key: str):
self.server_url = server_url
self.api_key = api_key
self.session = None
async def connect(self):
try:
self.transport = streamablehttp_client(url=self.server_url, headers={"SCP-HUB-API-KEY": self.api_key})
self._stack = AsyncExitStack()
await self._stack.__aenter__()
self.read, self.write, self.get_session_id = await self._stack.enter_async_context(self.transport)
self.session_ctx = ClientSession(self.read, self.write)
self.session = await self._stack.enter_async_context(self.session_ctx)
await self.session.initialize()
return True
except:
return False
async def disconnect(self):
"""Disconnect from server"""
try:
if hasattr(self, '_stack'):
await self._stack.aclose()
print("✓ already disconnect")
except Exception as e:
print(f"✗ disconnect error: {e}")
def parse_result(self, result):
try:
if hasattr(result, 'content') and result.content:
return json.loads(result.content[0].text)
return str(result)
except:
return {"error": "parse error"}
## Initialize and use
client = ChemistryClient("https://scp.intern-ai.org.cn/api/v1/mcp/24/Chemistry_and_Reaction_Calculations", "<your-api-key>")
await client.connect()
# Calculate mass percent of oxygen in H2O
mass_H = 2 * 1.008 # 2 hydrogen atoms
mass_O = 1 * 16.00 # 1 oxygen atom
total_mass = mass_H + mass_O
percent_O = (mass_O / total_mass) * 100
print(f"Mass percent of O in H2O: {percent_O:.2f}%")
await client.disconnect()